Summary:
Sometimes when you want to pick up an axolotl or fish in a bucket, you will pick them up in a bucket, but they will automatically be released. This happens sometimes and just in the water space, but most often when the mob is near the block.
Steps to reproduce:
Place the fish / axolotl in the water one block high.
Try to pick it up with a bucket.
If climbed into the bucket, repeat again.
Observed results:
Sometimes (almost always) the mob will automatically be released from the bucket.
Expected results:
The mob will not automatically release from the bucket.
Video:
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