Wheel overlapping in login and lock screens at 2x scaling (hidpi screen)
See my original report with a screenshot and details here: https://github.com/ubuntu/yaru/issues/1551
Although the report was for Yaru I was able to reproduce the issue in a vanilla Gnome session.
The main culprit seems to be screen scaling factor, as you can read in my last comment there.
AFAICS it's happening in both Gnome 3.32 and 3.34 (at least the version shipped with latest Ubuntu beta).
Edited by Carlos Pita