When putting a bucket of water or lava in a cauldron, in creative, you get an empty bucket.
You can tell that I'm getting an extra bucket by the fact that the bucket in the third inventory slot is larger than the water bucket.
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Duplicate of MCPE-13798, which is unfortunately resolved as won't fix.

Duplicate of MCPE-13798, which is unfortunately resolved as won't fix.

Oh sorry, I looked a lot, but didn't find anything.