When I make an environment for my axolotl's(breeding and all that, with water and cave like area) when I come back to play the next day they are all gone. It also happens with cows and chickens. It's for sure super frustrating.

I’ve actually seen something like this. I’ve captured axolotls before, and once I had to keep it in a hole that it couldnt escape, yet when I came back, it had despawned, even though I got it in a bucket. 

Please note that general game issues like this should be reported in the MCPE project unless they only happen on a realm.

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We're tracking this issue in MCPE-21416, so this ticket is being resolved and linked as a duplicate.

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