I thought all the unfinished stories were considered canon. Or does that only apply to events that have been adapted or mentioned in some other series?
I think the 2nd. For example Crystal crisis and Bad Batch, despite the unfinished animation and fx, were “officially” released as complete story reels and thus they were considered canon.
My current line of thought is that the unfinished material can be optionally considered canon until a newer work or adaptation overwrites or contradicts them. For example I can choose to believe whether Cad Bane was killed by Boba, while waiting for an upcoming source to confirm or deny it happened.