QWebEngine crashes in Debug build when opening PDF file

When using QWebEngine to open a PDF file, the application crashes in a debug build with the following error:

[2392:19364:0925/081102.094:ERROR:extension_function_dispatcher.cc(486)] Permission denied for metricsPrivate.recordValue
[2392:16644:0925/081102.143:FATAL:feature_list.cc(354)] Check failed: CheckFeatureIdentity(feature). RendererAppContainer

Everything seems to work fine in a release build (the PDF is properly displayed).

This can be reproduced with the "Qt-5.15.1\webenginewidgets\simplebrowser" example project:

1. Compile / execute the example in debug configuration
2. Within the "Qt Simple Browser" example application, use "File -> Open File..." to open any local PDF file
3. The application apparently tries to load the file but crashes within seconds
4. This works fine when doing the same in release configuration