I'm on java 1.17.1 single player. No mods or plugins.
Every other mob/animal I have is fine, but my axolotl are despawning, but it's not immediate. When I AFK for a while, I'll come back to 0 axolotl. I have an area where I breed them (Trying for blue) outside and a safe area in my home for my personal axolotl's. I have already picked up each of them with a water bucket and placed them back down, which shouldn't allow them to despawn