Qt 6.1/6.1.1 compilation fails after MSVC 2019 16.10 update with "/std:c++latest" compiler flag

Qt 6.1 and 6.1.1RC with MSVC 2019 16.10.31321.278 both fail on compilation of a cmake project set to c++ 20 standard with:

C:\Qt\6.1.1\msvc2019_64\include\QtCore/qproperty.h(53): fatal error C1083: Cannot open include file: 'experimental/source_location': No such file or directory

Changing L53 to
#include <source_location>
fixes this error.

Compilation now fails with:
C:\Qt\6.1.1\msvc2019_64\include\QtCore/qproperty.h(100): error C3083: 'experimental': the symbol to the left of a '::' must be a type

Changing L100 to
QPropertyBindingSourceLocation(const std::source_location &cppLocation)

will successfully build the application.

CMAKE Compiler output:
"The CXX compiler identification is MSVC 19.29.30037.0"

Relevant CMake setup:

set(CMAKE_CXX_STANDARD 20)

set(CMAKE_CXX_STANDARD_REQUIRED ON) 

set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /O2 /arch:AVX2 /Qpar /EHsc /Gw /Gy /std:c++latest") 

This may be sort of related to QTBUG-93270/QTBUG-93966.