rc.exe error RC1107 when path has space and using QtTest

I'm using the prerelease version of the Qt VS Tools 3.3.1 (rev.38) taken from this issue in Visual Studio 2019.

The ressource compiler rc.exe fails if the project uses "Qt Test" module and the project's file path contains a space character. The error message is: 

fatal error RC1107: invalid usage; use RC /? for Help

The reason is the rc.exe is called with a /D parameter containing nested quoted strings for QT_TESTCASE_BUILDDIR:

"C:\Program Files (x86)\Windows Kits\10\bin\10.0.22621.0\x86\rc.exe"
 /D _CONSOLE
 /D UNICODE
 /D _UNICODE
 /D WIN32
 /D _ENABLE_EXTENDED_ALIGNED_STORAGE
 /D WIN64
 /D QT_TESTLIB_LIB
 /D QT_CORE_LIB
 /D "QT_TESTCASE_BUILDDIR="D:/Qt Test Rc Space Err/x64/Debug/qt/qmake""
 /D _UNICODE
 /D UNICODE
/l0x0409
 "/ID:\Qt Test Rc Space Err\x64\Debug\qt\qmake"
 /IC:\Qt\6.5.3\include
 /IC:\Qt\6.5.3\include\QtTest
 /IC:\Qt\6.5.3\include\QtCore
 /IC:\Qt\6.5.3\mkspecs\win32-msvc
 "/ID:\Qt Test Rc Space Err"
 /ID:\dev\vcpkg\installed\x64-windows\include
 /nologo
 /fox64\Debug\QtTestRcSpaceErr.res QtTestRcSpaceErr.rc