Android QtBuildExternalsExtra.cmake has a backward slash in path which causes initial CMake eval to fail

"C:\Qt\6.5.2\android_arm64_v8a\lib\cmake\Qt6BuildInternals\QtBuildInternalsExtra.cmake"

    set(qtbi_orig_prefix "C:\Qt")

should likely be 

    set(qtbi_orig_prefix "C:/Qt")