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If you try to equip an item, which is in your bag and you do a zone change (i teleported with scroll) and you do not finishing drop it to character window you get following message:
[17:04] Source bag does not exist
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I would say this is out of date. Please open the report again if it isn't.
The bug is still present. The underlying issue is that the client does not send zone information in the action. Thus an action (drop, equip, etc) started in the previous zone tries to affect whatever object in the next zone happens to have the same id as the player had in the previous zone (and that new object probably does not have the same slots as a player)
Now this should be actually out of date. The client has been sending, and the server has been checking zone information for a year now.