Hi,
My Huion Inspiroy Q11K V2 Tablet stopped pressure sensitivity *around* build 563! I installed the latest Beta today and still have the same issue! Was totally fine before.
Using Widows 10 Pro latest Build. with latest Nvidia Drivers, Windows ink, and of course latest Huion driver.
All these latest drivers were working fine with Krita 4.2 alpha until more or less build 563!
Note: I see another user with another tablet manufacturer having the same issue!

That's most probably caused by the change of Qt version, and several patches Dmitry wrote to Qt to fix their tablet code issues. It usually works better now though...

Did you try Wintab? Reset your configuration, reinstall your driver etc.? Often Windows Update break tablet drivers, too, so we need to exclude this.