Not much help here. Maybe just empathy?
I noticed that it matters to where you are moving it.
I feel like maybe when this happens to me, I am pulling something out of nested groups and into the root. Where, Figma thinks, โoh, all this stuff does not need to be in a folder anymore.โ
Does that feel like what you are seeing?
I think I noticed that too, but using it more, I donโt have that happen now. I might have been assimilated.
I think that once the items have been moved they are invisibly selected and it feels as you describe it.
Just found a workaround by first unselecting the collection I want to move and then move it but itโs really annoying for such a simple task.