Try to start up any of the Qt WebEngine widget examples end up with crash.

In debug mode it can be seen that some assertion

ASSERT(getClientVersion() < ES_3_0 || formatMaxSamples >= 4); 

fails in

C:\Qt\6.6.3\Src\qtwebengine\src\3rdparty\chromium\third_party\angle\src\libANGLE\Context.cpp
  

like can be seen in the following screenshot:

Note, that the WebEngine examples start up nicely on the same Windows 11 guest machine, when environment QT_OPENGL=software is set.

Note, that all other Qt widgets and also Chrome browser are capable to run nicely on the same Windows 11 guest.

PS! VirtualBox Guest Display is configured as follows:

VirtualBox version 7.0.20: