Using a filled bucket on a cauldron in creative mode will cause an empty bucket to be added to the player's inventory without consuming the filled bucket. This will only happen if there is not already an empty bucket in the player's inventory and if the player's inventory has an empty slot for the empty bucket to appear in.
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Avoma
SPGoding
Thank you for your report!
We're tracking this issue in MC-203597, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-203597.