The Mac client has been more or less broken since mid-late 2019.
There are no fixes and while there are occassional acknowledgements from the Tech support, the company doesn’t appear too enthusiastic over spending money to fix these issues. These Mac issues are still very real in April 2021.
If you are playing on Mac, I would keep following the updates on the Mac Support hots subforum above.
The game runs a bit better on the brand-new M1 Macs, but there are other issues with it (like ground effects/spells being invisible).