Thank you for all the suggestions.
I first tried updating to the latest 2.1.60 version. I’m unsure if the bug is still present in this build as it is unusably slow for me (Bug. After upgrade to 2.1.60 UI becames too slow - #4 by Greenman). Every card review takes about 1 second for the viewport to re-render when I show an answer / move to the next card.
The good news is that I tried 2.1.60 QT5 build and not only is it lightning fast, the bug from my original post seems to be resolved.
Some extra info:
@dae I didn’t get around to experimenting with different drivers before I resolved the issue. I’m not sure if there is a typo in the “Display Issues” page that mentions %APPDATA%\Anki2\gldriver6, but I don’t have this file with a 6 at the end. I do have a gldriver file, which is set to angle.
Also version 2.1.60 seems to have introduced a visual artifact into the card view (shown below in my screenshot, red arrows pointing to it). And if I may say, the white, transparent strip at the top (yellow arrows) is quite obnoxious.
Let me know if you’d like me to run any tests. Happy to help iron out any kinks.