EDIT: Duplicate of MC-275220
Salmon, both in survival and creative, are very likely to have a different size when you put them in a bucket and take them out again.
This bug can be reproduced by simply catching a salmon in a bucket and repeatedly letting it out and putting it back into said bucket, observing as the size changes randomly each time.
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We're tracking this issue in MC-275220, so this ticket is being resolved and linked as a duplicate.
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