The sniffer is erased, but it will be restored.

I was breeding Sniffers in Survival mode.
I moved them, but after relogging, their positions reverted to the original ones.

Even if I name them or kill them, after relogging, only the Sniffers from before naming reappear.
I checked a copied world in Creative mode, but I couldn't erase only the Sniffers.
Newly hatched Sniffers had no issues.
Only the existing Sniffers' data keeps rolling back.

 

https://drive.google.com/file/d/15gpATY5JWhcFuJ1WRZHVrDBN12exyxBV/view?usp=drive_link

x,y,z : -4290, 70, -2247