The bug
After being picked up and placed again with a bucket, then placed into an enclosure where it should be impossible for them to die, sometimes the axolotls will disappear for seemingly no reason. This bug never occurred when someone was watching, it was always when somebody would leave for a few minutes and come back to the pen to find one missing. In one case it happened on a Realm in a 30 minute period when nobody was online.
To reproduce
Gather axolotls and put them in an enclosure where they should not be able to die (this happened both when there was and was not land for them to go on, but no drowned were able to spawn)
Wait; occasionally leave and come back to the axolotls to see if they are all still there.
Expected Results
The axolotls will still be there
Actual Results
Occasionally, an axolotl will disappear without a trace
Image description
The image attached is a screenshot of the enclosure my axolotls are currently kept in.
Related issues
Attachments
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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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This is happening with every axioltl I bring back to my base. I pick them up in a bucket. I release them into a pond I made for them. When I leave the area to go mine or explore or log off for the night, when I come back to my base or log back on the next day they are gone. Frustrated I named two new ones I placed in my pond with name tags even though the wiki says any picked up with a bucket won’t despawn, but still when I logged on the next day both were gone. I cannot keep any axioltl at all. This is really upsetting because we are supposed to be able to keep them as pets.

This is happening to me also.
I can't keep axototls in a created pen. I put 6 in a pen and they vanished. On second attempt; the issue was supposed to be resolved. Replacement axototls placed in same pen. 6 more... I was going to try to breed a blue one. I had to go catch some tropical fish. Upon return. The pen is empty of axototls.
That's not a very happy Minecraft adventure session. They seem to do fine sitting in buckets. I just don't think it's very humane keeping them in buckets for too long. The guilt!
I'm using the Java version. 1.17.1 .... that one; in multiplayer.

This also happened to me. I found all 4 colors in a cave together and I collected them all with buckets and made a safe enclosure for them, where they couldn’t die. I named them as well, so that was another despawn prevention. They never despawned for a while until today, when i noticed my cyan axolotl vanished. It made me extremely frustrated, because I lost a valuable name tag to a stupid glitch that should not exist.

It's still happening in Java edition.
I experienced 8 axololts vanishing. Two of my kids have experienced the majority of their salamanders vanishing. Things seemed like they were working in the Java edition. The fact that it's a bedrock edition issue also is a flaming arrow towards bad code.
You bunch over hyped the salamander things. Now... Roblox is the game two of my kids turn to first for entertainment. There is only so much ice cream you can buy to sweeten away the tears of frustration. For kids on the spectrum this can be a serious issue.
I'm pissed that it took 14 tropical fish to successfully breed one baby axolotl in a population of 6 captured, then contained, wild adults.
The game was fine without the salamanders. You added the amphibians and then over hyped them. Now the pound of flesh is being called to account.
I can feel for my kids. I'm pissed now. I went out and captured over 24 of these silly things and... have three offspring left to show for the effort. Three different containment solutions, three different biomes. You made them and then marketed them to an audience that paid.
Well... where is the entertainment value in that investment by your customer base?
PS.
While I was composing this post. I'm logged into our family server. I was looking at an aquarium view with one axolotl left in the display. It was the one successful axolotl that I spawned by breeding two captured wild salamanders.... vanished.
It's just gone! Yes... it's just... gone! I didn't log out. I did adjust some inventory items between a shulker box and an ender chest. Regardless... the digital salamander is gone. Gone like the wind. I hope Mojoang isn't going to say to us: "Frankly player, we don't give a damn!"
Gone with the Mojang!
This isn't fun. So much for the entertainment. I'm sure Douglas Adams might have something nice to say about this. Thanks for all the tropical fish?