Thanks for testing it.
It looks like they fixed this bug only for Windows Server 2016 and not for Windows 10, as they used a flag "QT_WIN_SERVER_2016_COMPAT", which seems that it is not defined or used in Windows 10 (the zip file I uploaded actually contains the fix but as you know, it didn't solve the issue in Win10, if you run that in Windows Server 2016 it should work).
Anyway, I went ahead and compiled Qt v6.7.3 (latest version of the 6.7 branch) for you, which doesn't contain SetThreadDescription at all in the source files. Therefore, it should work. Have a look and see if this one works for you. I uploaded it as Qt6.7.3.zip.