Assertion when viewing DRM video on macOS in debug build with proprietary codecs enabled

[99140:43523:1128/145854.845568:ERROR:service_manager.cc(156)] Connection InterfaceProviderSpec prevented service: content_plugin from binding interface: memory_instrumentation::mojom::Coordinator exposed by: content_browser
[99140:43523:1128/145854.962428:INFO:ppapi_host.cc(246)] Failed to create PPAPI resource host142151
[99140:43523:1128/145854.962560:INFO:ppapi_host.cc(246)] Failed to create PPAPI resource host141836
[99144:775:1128/145854.963028:ERROR:ppapi_decryptor.cc(52)] Unable to create the CDM for the key system com.widevine.alpha.
[99140:43523:1128/145854.974836:FATAL:ppapi_host.cc(276)] Check failed: false. 
0   libQt5WebEngineCore_debug.5.dylib   0x000000011289c0fe base::debug::StackTrace::StackTrace(unsigned long) + 174
1   libQt5WebEngineCore_debug.5.dylib   0x000000011289c15d base::debug::StackTrace::StackTrace(unsigned long) + 29
2   libQt5WebEngineCore_debug.5.dylib   0x000000011289a59c base::debug::StackTrace::StackTrace() + 28
3   libQt5WebEngineCore_debug.5.dylib   0x0000000112913b2f logging::LogMessage::~LogMessage() + 479
4   libQt5WebEngineCore_debug.5.dylib   0x0000000112911445 logging::LogMessage::~LogMessage() + 21
5   libQt5WebEngineCore_debug.5.dylib   0x0000000117b121ea ppapi::host::PpapiHost::OnHostMsgResourceDestroyed(int) + 650
6   libQt5WebEngineCore_debug.5.dylib   0x0000000117b161eb void base::DispatchToMethodImpl<ppapi::host::PpapiHost*, void (ppapi::host::PpapiHost::*)(int), std::__1::tuple<int> const&, 0ul>(ppapi::host::PpapiHost* const&, void (ppapi::host::PpapiHost::*)(int), std::__1::tuple<int> const&&&, base::IndexSequence<0ul>) + 155
7   libQt5WebEngineCore_debug.5.dylib   0x0000000117b16149 void base::DispatchToMethod<ppapi::host::PpapiHost*, void (ppapi::host::PpapiHost::*)(int), std::__1::tuple<int> const&>(ppapi::host::PpapiHost* const&, void (ppapi::host::PpapiHost::*)(int), std::__1::tuple<int> const&&&) + 73
8   libQt5WebEngineCore_debug.5.dylib   0x0000000117b160dd void IPC::DispatchToMethod<ppapi::host::PpapiHost, void (ppapi::host::PpapiHost::*)(int), void, std::__1::tuple<int> >(ppapi::host::PpapiHost*, void (ppapi::host::PpapiHost::*)(int), void*, std::__1::tuple<int> const&) + 93
9   libQt5WebEngineCore_debug.5.dylib   0x0000000117b11eee bool IPC::MessageT<PpapiHostMsg_ResourceDestroyed_Meta, std::__1::tuple<int>, void>::Dispatch<ppapi::host::PpapiHost, ppapi::host::PpapiHost, void, void (ppapi::host::PpapiHost::*)(int)>(IPC::Message const*, ppapi::host::PpapiHost*, ppapi::host::PpapiHost*, void*, void (ppapi::host::PpapiHost::*)(int)) + 478
10  libQt5WebEngineCore_debug.5.dylib   0x0000000117b0f534 ppapi::host::PpapiHost::OnMessageReceived(IPC::Message const&) + 1556
11  libQt5WebEngineCore_debug.5.dylib   0x00000001110b9d07 content::BrowserPpapiHostImpl::HostMessageFilter::OnMessageReceived(IPC::Message const&) + 391
12  libQt5WebEngineCore_debug.5.dylib   0x000000010e956cbe content::ChildProcessHostImpl::OnMessageReceived(IPC::Message const&) + 302
13  libQt5WebEngineCore_debug.5.dylib   0x000000010e95718c non-virtual thunk to content::ChildProcessHostImpl::OnMessageReceived(IPC::Message const&) + 44
14  libQt5WebEngineCore_debug.5.dylib   0x000000011500261f IPC::ChannelMojo::OnMessageReceived(IPC::Message const&) + 399
15  libQt5WebEngineCore_debug.5.dylib   0x000000011500281c non-virtual thunk to IPC::ChannelMojo::OnMessageReceived(IPC::Message const&) + 44
16  libQt5WebEngineCore_debug.5.dylib   0x00000001150298c3 IPC::internal::MessagePipeReader::Receive(std::__1::vector<unsigned char, std::__1::allocator<unsigned char> > const&, base::Optional<std::__1::vector<mojo::StructPtr<IPC::mojom::SerializedHandle>, std::__1::allocator<mojo::StructPtr<IPC::mojom::SerializedHandle> > > >) + 979
17  libQt5WebEngineCore_debug.5.dylib   0x000000011506db54 IPC::mojom::ChannelStubDispatch::Accept(IPC::mojom::Channel*, mojo::Message*) + 1412
18  libQt5WebEngineCore_debug.5.dylib   0x000000011502a343 IPC::mojom::ChannelStub<mojo::RawPtrImplRefTraits<IPC::mojom::Channel> >::Accept(mojo::Message*) + 83
19  libQt5WebEngineCore_debug.5.dylib   0x0000000114f9339c mojo::InterfaceEndpointClient::HandleValidatedMessage(mojo::Message*) + 5804
20  libQt5WebEngineCore_debug.5.dylib   0x0000000114f91ce1 mojo::InterfaceEndpointClient::HandleIncomingMessageThunk::Accept(mojo::Message*) + 33
21  libQt5WebEngineCore_debug.5.dylib   0x0000000114f9017d mojo::FilterChain::Accept(mojo::Message*) + 813
22  libQt5WebEngineCore_debug.5.dylib   0x0000000114f96da2 mojo::InterfaceEndpointClient::HandleIncomingMessage(mojo::Message*) + 242
23  libQt5WebEngineCore_debug.5.dylib   0x0000000115038d2b IPC::(anonymous namespace)::ChannelAssociatedGroupController::Accept(mojo::Message*) + 1867
24  libQt5WebEngineCore_debug.5.dylib   0x000000011503911c non-virtual thunk to IPC::(anonymous namespace)::ChannelAssociatedGroupController::Accept(mojo::Message*) + 44
25  libQt5WebEngineCore_debug.5.dylib   0x0000000114f9017d mojo::FilterChain::Accept(mojo::Message*) + 813
26  libQt5WebEngineCore_debug.5.dylib   0x0000000114f804f5 mojo::Connector::ReadSingleMessage(unsigned int*) + 949
27  libQt5WebEngineCore_debug.5.dylib   0x0000000114f817ab mojo::Connector::ReadAllAvailableMessages() + 123
28  libQt5WebEngineCore_debug.5.dylib   0x0000000114f8156f mojo::Connector::OnHandleReadyInternal(unsigned int) + 271
29  libQt5WebEngineCore_debug.5.dylib   0x0000000114f8144b mojo::Connector::OnWatcherHandleReady(unsigned int) + 27
30  libQt5WebEngineCore_debug.5.dylib   0x0000000114f8393b void base::internal::FunctorTraits<void (mojo::Connector::*)(unsigned int), void>::Invoke<mojo::Connector*, unsigned int>(void (mojo::Connector::*)(unsigned int), mojo::Connector*&&, unsigned int&&) + 139
31  libQt5WebEngineCore_debug.5.dylib   0x0000000114f83876 void base::internal::InvokeHelper<false, void>::MakeItSo<void (mojo::Connector::* const&)(unsigned int), mojo::Connector*, unsigned int>(void (mojo::Connector::* const&&&)(unsigned int), mojo::Connector*&&, unsigned int&&) + 86
32  libQt5WebEngineCore_debug.5.dylib   0x0000000114f837f3 void base::internal::Invoker<base::internal::BindState<void (mojo::Connector::*)(unsigned int), base::internal::UnretainedWrapper<mojo::Connector> >, void (unsigned int)>::RunImpl<void (mojo::Connector::* const&)(unsigned int), std::__1::tuple<base::internal::UnretainedWrapper<mojo::Connector> > const&, 0ul>(void (mojo::Connector::* const&&&)(unsigned int), std::__1::tuple<base::internal::UnretainedWrapper<mojo::Connector> > const&&&, base::IndexSequence<0ul>, unsigned int&&) + 115
33  libQt5WebEngineCore_debug.5.dylib   0x0000000114f83724 base::internal::Invoker<base::internal::BindState<void (mojo::Connector::*)(unsigned int), base::internal::UnretainedWrapper<mojo::Connector> >, void (unsigned int)>::Run(base::internal::BindStateBase*, unsigned int&&) + 68
34  libQt5WebEngineCore_debug.5.dylib   0x000000010df3bd97 base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1>::Run(unsigned int) const + 87
35  libQt5WebEngineCore_debug.5.dylib   0x000000010faef5bf mojo::SimpleWatcher::DiscardReadyState(base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, unsigned int, mojo::HandleSignalsState const&) + 31
36  libQt5WebEngineCore_debug.5.dylib   0x000000010faef8b4 void base::internal::FunctorTraits<void (*)(base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, unsigned int, mojo::HandleSignalsState const&), void>::Invoke<base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, unsigned int, mojo::HandleSignalsState const&>(void (*)(base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, unsigned int, mojo::HandleSignalsState const&), base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&&&, unsigned int&&, mojo::HandleSignalsState const&&&) + 68
37  libQt5WebEngineCore_debug.5.dylib   0x000000010faef830 void base::internal::InvokeHelper<false, void>::MakeItSo<void (* const&)(base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, unsigned int, mojo::HandleSignalsState const&), base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, unsigned int, mojo::HandleSignalsState const&>(void (* const&&&)(base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, unsigned int, mojo::HandleSignalsState const&), base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&&&, unsigned int&&, mojo::HandleSignalsState const&&&) + 80
38  libQt5WebEngineCore_debug.5.dylib   0x000000010faef7d0 void base::internal::Invoker<base::internal::BindState<void (*)(base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, unsigned int, mojo::HandleSignalsState const&), base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> >, void (unsigned int, mojo::HandleSignalsState const&)>::RunImpl<void (* const&)(base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, unsigned int, mojo::HandleSignalsState const&), std::__1::tuple<base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> > const&, 0ul>(void (* const&&&)(base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, unsigned int, mojo::HandleSignalsState const&), std::__1::tuple<base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> > const&&&, base::IndexSequence<0ul>, unsigned int&&, mojo::HandleSignalsState const&) + 112
39  libQt5WebEngineCore_debug.5.dylib   0x000000010faef6d4 base::internal::Invoker<base::internal::BindState<void (*)(base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> const&, unsigned int, mojo::HandleSignalsState const&), base::Callback<void (unsigned int), (base::internal::CopyMode)1, (base::internal::RepeatMode)1> >, void (unsigned int, mojo::HandleSignalsState const&)>::Run(base::internal::BindStateBase*, unsigned int&&, mojo::HandleSignalsState const&) + 84
40  libQt5WebEngineCore_debug.5.dylib   0x0000000114fe678d base::Callback<void (unsigned int, mojo::HandleSignalsState const&), (base::internal::CopyMode)1, (base::internal::RepeatMode)1>::Run(unsigned int, mojo::HandleSignalsState const&) const + 109
41  libQt5WebEngineCore_debug.5.dylib   0x0000000114fe655b mojo::SimpleWatcher::OnHandleReady(int, unsigned int, mojo::HandleSignalsState const&) + 459
42  libQt5WebEngineCore_debug.5.dylib   0x0000000114fe692d mojo::SimpleWatcher::Context::Notify(unsigned int, MojoHandleSignalsState, unsigned int) + 333
43  libQt5WebEngineCore_debug.5.dylib   0x0000000114fe4cc7 mojo::SimpleWatcher::Context::CallNotify(unsigned long, unsigned int, MojoHandleSignalsState, unsigned int) + 71
44  libQt5WebEngineCore_debug.5.dylib   0x00000001167fc0ef mojo::edk::WatcherDispatcher::InvokeWatchCallback(unsigned long, unsigned int, mojo::HandleSignalsState const&, unsigned int) + 207
45  libQt5WebEngineCore_debug.5.dylib   0x00000001167fac61 mojo::edk::Watch::InvokeCallback(unsigned int, mojo::HandleSignalsState const&, unsigned int) + 385
46  libQt5WebEngineCore_debug.5.dylib   0x00000001167ed55a mojo::edk::RequestContext::~RequestContext() + 1306
47  libQt5WebEngineCore_debug.5.dylib   0x00000001167ed825 mojo::edk::RequestContext::~RequestContext() + 21
48  libQt5WebEngineCore_debug.5.dylib   0x00000001167a3f0e mojo::edk::NodeChannel::OnChannelMessage(void const*, unsigned long, std::__1::unique_ptr<std::__1::vector<mojo::edk::PlatformHandle, std::__1::allocator<mojo::edk::PlatformHandle> >, mojo::edk::PlatformHandleVectorDeleter>) + 15182
49  libQt5WebEngineCore_debug.5.dylib   0x000000011675ee9a mojo::edk::Channel::OnReadComplete(unsigned long, unsigned long*) + 3162
50  libQt5WebEngineCore_debug.5.dylib   0x0000000116761db7 mojo::edk::(anonymous namespace)::ChannelPosix::OnFileCanReadWithoutBlocking(int) + 1175
51  libQt5WebEngineCore_debug.5.dylib   0x000000011676210f non-virtual thunk to mojo::edk::(anonymous namespace)::ChannelPosix::OnFileCanReadWithoutBlocking(int) + 31
52  libQt5WebEngineCore_debug.5.dylib   0x0000000112970931 base::MessagePumpLibevent::FileDescriptorWatcher::OnFileCanReadWithoutBlocking(int, base::MessagePumpLibevent*) + 65
53  libQt5WebEngineCore_debug.5.dylib   0x00000001129721aa base::MessagePumpLibevent::OnLibeventNotification(int, short, void*) + 906
54  libQt5WebEngineCore_debug.5.dylib   0x000000011388b0ad event_process_active + 365
55  libQt5WebEngineCore_debug.5.dylib   0x000000011388a614 event_base_loop + 468
56  libQt5WebEngineCore_debug.5.dylib   0x000000011297269e base::MessagePumpLibevent::Run(base::MessagePump::Delegate*) + 1118
57  libQt5WebEngineCore_debug.5.dylib   0x000000011295f6d3 base::MessageLoop::Run() + 291
58  libQt5WebEngineCore_debug.5.dylib   0x000000011295f719 non-virtual thunk to base::MessageLoop::Run() + 25
59  libQt5WebEngineCore_debug.5.dylib   0x0000000112a2a32e base::RunLoop::Run() + 286
60  libQt5WebEngineCore_debug.5.dylib   0x0000000112b18135 base::Thread::Run(base::RunLoop*) + 405
61  libQt5WebEngineCore_debug.5.dylib   0x000000010fc9d167 content::BrowserThreadImpl::IOThreadRun(base::RunLoop*) + 71