if you have 2 non stackable items in your hotbar and you switch to another spot on your hotbar as you use your throw key the original item will throw but stay in your hotbar and taking up a slot and others can see it it just doesnt have the same properties but the slot you switched to will be empty and items can go into it but will have all the properties of the item that was in that slot
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Your client is modified @unknown as shown by the voice chat icon in the bottom left. Please reproduce the issue in vanilla.
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We're actually already tracking this issue in MC-154881, so this ticket is being resolved and linked as a duplicate.
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Can confirm in 23w51b, in Singleplayer, survival mode or creative mode. Item duplication seems to only occur in creative mode.