Hi,
I would love if the Affinity team could resolve this bug, because disabling Windows Ink has been previously recommended to avoid an issue with changing focus to different apps messing with the brush functionality - and also messing with the functionality of navigating on the canvas using space shortcut (Win 10, Wacom Intuos Pro, Cintiq 16).
Having it disabled and losing pressure of the pen is however even worse.
So it is very inconvenient to restart the program every time the focus bug occurs, which can happen very often (every 5-15 minutes, when you work with reference on your other screen or just want to switch music).