There is a crash in 4.19 that’s quite bad:
LogObj: Warning: Object MediaPlayer /Game/Movies/MyVideoPlayer.MyVideoPlayer (0x000001fb95235780) from cluster Material /Game/Movies/VideoMat.VideoMat (0x000001fb957b7720 / 0x000001fba6ec6280) is referencing 0x000001fb8b0de4c0 MediaPlaylist /Engine/Transient.MediaPlaylist_11 which is not part of root set or cluster. Error: Encountered object(s) breaking Disregard for GC assumption. Please check log for details.
I’m only seeing that crash rarely and it appears pretty random while a media player is running, and most often while unloading a level where there was a MediaPlayer playing before. I have heard about other people though where this crash happened more often.
The crash seems to be fixed by unticking this:
Is that a known issue? Is it fixed already in 4.20? I can’t really reproduce this, so that’s hard to know. If you also see this issue, please comment! I’m not sure how good of a “fix” disabling GC clustering is, since it sounds like that will negatively impact performance.