Never seen this before, after reopening a project from yesterday, some of my clip sections showed as black screens but then if I moved it up to a different track the video appeared again. Also weird that the whole clip isn't black, just a few seconds. At first, I thought it was because of the effects I had on the clip that was messing it up but even after deleting the effects and resetting the workspace, it would still show as black. Unlinking media and relinking did not fix the black screen, the only solution I've found so far is to move it to a different track. I also am wondering if it is connected to using the text panel to cut sections out of the video because when I did that it shifted my clips over but the cross dissolve didn't move with it so I had 2 clips where the cross dissolve was in the middle of the clip. To fix that I copied the clip, deleted it, and then pasted the clip again and it was back to normal. But that's when I noticed the black screen sections.
I've already found the workaround for this bug, so no need to give any advice, I'm just reporting it.