QDebugMessageServiceFactoryPlugin_init.cpp.obj is incorrectly dynamically linked instead of statically linked to runtime library

After statically building Qt 6.2 Beta 1 with static runtime, when compiling my own static app one file (QDebugMessageServiceFactoryPlugin_init.cpp.obj) appears to use the dynamic runtime , resulting in thousands of RuntimeLibrary mistmatch errors.

An example error message is:

qmlcache_loader.cpp.obj:-1: error: LNK2038: mismatch detected for 'RuntimeLibrary': value 'MTd_StaticDebug' doesn't match value 'MDd_DynamicDebug' in QDebugMessageServiceFactoryPlugin_init.cpp.obj

Running on Windows 10. Visual Studio 2019 v16.10.3

Repro steps:

1. Download source files from: https://download.qt.io/development_releases/qt/6.2/6.2.0-beta1/single/qt-everywhere-src-6.2.0-beta1.zip
2. ..\qt6\configure.bat -nomake examples -nomake tests -opensource -confirm-license -debug-and-release -static -static-runtime -schannel -prefix C:\Qt\6.2.0-beta1\msvc2019_64_static -skip qtquick3d
3. cmake --build . --parallel
4. cmake --install .
5. cmake --install . --config Debug