I don't seem to be able to reproduce it here (macOS 12, my shiny new ARM machine).
A few questions: 1. Is this a regression or does the same thing happen with previous releases too? 2. Is this bug reproducible or does it happen just sometimes? Is there some specific procedure one has to follow to reproduce this issue? Have you tried restarting your Mac in case something just got broken in the OS? 3. Does the same happen also with the Macbook's touchpad and scrolling using 2-finger gesture?
Not sure if this could be related but there are several issues with the current GTK theme I'd like to address and I'll post a new release for testing in a few days.