I think Alex might be right about the XMP data, so I would definitely give that a shot.
As a side rant, I wish multiple mono tracks associated with video would keyframe at once (maybe with a modifier key) instead of needing to be done individually. I know you can paste attributes, but its a lot of steps. Oddly, this was Avid’s old way of behaving and now it works in the same maddening way as Premiere.