Intermittent: Screen inspector losing connection with playback markers

I have a screen inspector element that is supposed to get the markers from "playback in click". But sometimes the markers are not there, they disappear. the only way I can get them to come back is deleting the entire playback strip and rebuilding it. but then they can disappear again. Also notice that sometimes the markers are there on the edit page but not on the perform page.

Kind of an urgent problem, as I need these. upcoming tour starts on Monday. emoji with sweat drops.