Went back to version 2.2.8. I use a feature whereby if you place the cursor on the timeline bar, using the scroll button on mouse up and down will advance time forward and backward. In 2.2.8 the motion is smooth, and the increments predictable. In 3.0.6 it will work sometimes, then other times the time marker will jump randomly to a spot far ahead (or behind) what you would expect based on the degree of motion on the scroll, sometimes as much as 30+ minutes ahead or back, when at most it should have incremented a minute give or take (compared to 2.2.8).
This is a deal breaker for me, as I use this feature constantly to review short, specific clips over and over. I'm a little hard of hearing, so when I'm watching a video, often I miss something or can't make it out unless I hear it repeated a few times, so this feature to be able to quickly scroll back in very short increments is useful. Yes, I know you can click on the timeline bar, but the granularity is not as fine as using the scroll feature. For a 2 hour movie, clicking even the slightest amount on either side of the current time marker still results in a jump of several minutes or more, instead of seconds. This is on a Mac mini 2018 with the i7 upgrade, so I know it is not due (or shouldn't be) to CPU or video lag. it has been reported (actually had already reported it when 3.0.0 came out)