I've noticed while playing that if you have an item in the main hand and another in the secondary hand and you keep pressing the key to put an item in the second hand or after a while one of the items will be replaced by the other I've tried several times and the time before the item is duplicated is random, I'll send you a video proof.
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Cannot reproduce in 1.20.1, may I ask if you are reproducing this bug with the use of a spigot server, realm, or single player world?
Please attach a screenshot of this occurring while the F3 debug screen is enabled.
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I'm unable to reproduce this. I can't switch as quickly as in your video which is why I was asking about macros.
Is the duplicated item one that you can use to craft with? If so please attach a video of that. I am wondering if this is just desync due to switching items too quickly.
After testing again I can confirm that this is possible but only with a macro on your item swap key. Without it, the item behaves properly and is not duplicated from what I have observed.
After trying more than 20 times, I was unable to replicate the duplication myself.
Could be related to/duplicated by MC-5415