Intended Behaviour: When naming the "fish in a bucket", the placed fish will be named (similar to a nametag) the same name as the bucket.
Steps to reproduce:
Obtain fish in a bucket.
Use anvil to rename fish in a bucket.
Use fish in a bucket, spawning the corresponding fish.
Observe lack of unique name.
This worked in previous versions, and seems to be removed / not working.
Thank you for your report!
We're tracking this issue in MCPE-57604, so this ticket is being resolved and linked as a duplicate.
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