Created attachment 135962 [details]
screen recording showing non-working tool switch

SUMMARY
I use a Wacom tablet and most of the time everything works fine and krita is amazing!
Sometimes when switching pens krita accidentally enters an unwanted mode. I have observed that to be either "rotate" or "zoom". The problem is that this only works very briefly. For example rotating the canvas a little. But the rotate tool or magnifying glass stays stuck to the cursor. Pressing Escape, selecting another tool etc do not get rid of the changed cursor. While the pointer works to select menu items, tools, pretty much anywhere in the UI - it does not have any effect to the canvas image. Not even the advertised zoom or rotate function. The only work around I found is to save the work, restart krita and load the file back in.


Here are two reports that sound very similar:
https://forum.kde.org/viewtopic.php?f=139&t=152016
https://krita-artists.org/t/magnifying-glass/3946


STEPS TO REPRODUCE
This happens with a low but sufficiently annoying frequency in my setup. 
1. switch brush/tool (from right click menu or docker)
2. get annoyed when something unexpected like zoom or rotate happens

OBSERVED RESULT
* selected tool non-functional and cannot be deselected
(screen recording attached)

EXPECTED RESULT
* regardless of what tool was accidentally selected somehow the tool picker should restore the cursor to a working state


SOFTWARE/OS VERSIONS
macOS: 11.2.1

ADDITIONAL INFORMATION