5abeff2768
The ID lines were gated by lastItemId/lastGuid (only added when the hovered item/unit changed). WoW clears and re-fires OnTooltipSetItem/ OnTooltipSetUnit for the same item/unit and rebuilds the tooltip, so the gate skipped re-adding the line on the rebuilt tooltip and the ID disappeared. Add the ID line on every render instead, deduped per tooltip via _TooltipHasLeftLine so it shows exactly once.