Under server lag BAG_UPDATE can fire before item data arrives, causing
GetContainerItemInfo to return nil for a still-occupied slot and Bagnon
to broadcast ITEM_SLOT_UPDATE with no link — the slot then renders empty
until the next bag event. UpdateItem now queues a single ~0.25s retry
for the bag when a previously occupied slot reads nil; the retry pass
trusts whatever it reads, so genuine empties still resolve.
florian.berthold
1af22578d7