6.2.0-rc fails to build with some MOC-gen error

[471/12212] Automatic MOC for target DeviceDiscoverySupportPrivate
FAILED: qtbase/src/platformsupport/devicediscovery/DeviceDiscoverySupportPrivate_autogen/timestamp
cmd.exe /C "cd /D C:\qtb\bld\qtbase\src\platformsupport\devicediscovery && "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe" -E cmake_autogen C:/qtb/bld/qtbase/src/platformsupport/devicediscovery/CMakeFiles/DeviceDiscoverySupportPrivate_autogen.dir/AutogenInfo.json Release && "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe" -E cmake_autogen C:/qtb/bld/qtbase/src/platformsupport/devicediscovery/CMakeFiles/DeviceDiscoverySupportPrivate_autogen.dir/AutogenInfo.json Debug && "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe" -E touch C:/qtb/bld/qtbase/src/platformsupport/devicediscovery/DeviceDiscoverySupportPrivate_autogen/timestamp && "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\IDE\CommonExtensions\Microsoft\CMake\CMake\bin\cmake.exe" -E cmake_transform_depfile "Ninja Multi-Config" gccdepfile C:/qtb/qt-everywhere-src-6.2.0-rc C:/qtb/qt-everywhere-src-6.2.0-rc/qtbase/src/platformsupport/devicediscovery C:/qtb/bld C:/qtb/bld/qtbase/src/platformsupport/devicediscovery C:/qtb/bld/qtbase/src/platformsupport/devicediscovery/DeviceDiscoverySupportPrivate_autogen/deps C:/qtb/bld/CMakeFiles/d/74e0ce0b1de875f5a89e916f171c8de1a47cb2ab0ea0be1e2bc8dd68ee59de13.d"
[472/12212] Automatic MOC for target Network
AutoMoc: C:/qtb/qt-everywhere-src-6.2.0-rc/qtbase/src/network/access/qnetworkaccessdebugpipebackend_p.h(0:1): note: No relevant classes found. No output generated.
AutoMoc: C:/qtb/qt-everywhere-src-6.2.0-rc/qtbase/src/network/access/qnetworkaccessdebugpipebackend_p.h(0:1): note: No relevant classes found. No output generated.
[478/12212] Automatic MOC for target Gui
ninja: build stopped: subcommand failed.