Am currently on Anki 2.1.46 (94913ec2) on Linux Mint (20.2; the latest/current).
Python 3.8.1 Qt 5.15.1 PyQt 5.15.1.
I noticed this first on Anki 2.1.45, but did not post.
When I have learnt some cards in a deck, I return to the deck screen, and click on Sync. The little window describing the synchronisation pops up, but when it completes, the underlying home screen of Anki does not regain focus; it stays washed out.
Am trying to narrow down the exact steps that make this happen.
Obviously not a big problem, but thought you would like a heads-up.
Many thanks