Sometimes when shift clicking an item into the creative inventory, the item desyncs. This causes ghost items which are annoying to get rid of. There is no real easy way to reproduce this that I have found. You can see the attached videos of multiple instances of this ghost item state.
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I can confirm this is still an issue as of 25w20a, and am able to consistently reproduce the issue with the following steps:
Open your inventory in creative mode
Go to any creative mode items tab
Hold down SHIFT (and don’t let go for the remainder of these steps)
Pick up an item (or a stack of items) with left-click
Place the item stack in any slot of your hotbar with left-click
Left-click on the updated item stack in your hotbar
As expected, the item is removed from your inventory. However, it appears that, under this circumstance, the client fails to send the set_creative_mode_slot packet to the server, causing the desync. This also happens in singleplayer.
After a few attempts, I can confirm.