Two causes, both leaving the block at the old slot or dimmed for a frame or
several. The source is now identified for the write's duration by event row
plus the slot it left, not by instance id — the provider renumbers Instances
rows, so a re-read still carrying the old time arrives under a new id and
the ghost stopped matching. And the ghost is dropped when the copy *starts*
dissolving rather than after: un-ghosting last left the block dim under the
fading copy and brightened it once the copy was gone.
Jean-Luc Makiola
4412038caa