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

1. 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)
2. 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.