Is that the reason why several of your videos were cut at ~70%?

The problem is, that you probably will have to become active on the issue, or maybe rally other DTubers around you, collect some $$ or coding skills and then fix the problem yourself.

The witnesses&developers will only become active when you really push them and when you put in some vesting weight. Maybe, if you find a whale with enough vests who wants it to be fixed as well can help you pushing it up on the priority list. Otherwise, you have to wait or DIY.