Only issue I have with these is if you only put two markers down, the original marker becomes inaccurate. For example, let’s say I have a song that goes from 100bpm to 67bpm. If I put a second market at the 67bpm section, my 100bpm portion of the track is now being gridded at 99.2bpm, which throws off that portion. I think the second marker shouldn’t affect the bpm of the first at all, and should only change the portion after the marker as it looks like it’s supposed to do in the video.
Current workaround is to actually place TWO markers. Place 1 at the end of the 100bpm section in my example, and place another at the beginning of the 67bpm portion of the track. That way only the middle section gets changed, and the others stay on beat.