Sometimes don't work mouse wheel scroll
How to fix?
@hahakotoko: Too little info from you to guess.
I notice this bug in latest Opera, not very often, not Vivaldi (yet). So it can be something wrong with Chromium engine.
I have noticed this as well, especially on my laptop where I use 2 fingers on my track pad to scroll all the time. Not a major issue, and only happens at random for me.