I use the same "project file" for everything, i just swap out or add new videos.
I know the "offline" videos are missing, I deleted them from the timeline.
Now after updating, when I go to export, i get issues about offline items that are not on the timeline, just in the folder. It should be clear they are not meant to be in the video.
"remove all offline videos" would help as well, i have hundreds in one file