Sequencer recursion was never actually supported and only gives lots of issues. Disabled it now, so users are not getting confused by semi-working stuff. Also made a correction to rendered sequencer preview, so now using scene strip in it's own sequencer will work properly (it produced black frames before). This required killing compositor jobs since they could be using the same render result as renderer called from sequencer uses. Small improvements could be: - Add slight delay before compositor job starts handling nodes so killing this job would be fast - Tag compositor to be updated after preview was fully rendered.