Tamed wolves leashed to a fence teleport to the player in the moment the game is loaded.

Steps to reproduce:

1. Leash a wolf to a fence
2. Go somewhere (not so) far away (in my case it's just opposite side of the village)
3. Save the game and close Minecraft
4. Load the game again and wait
5. ISSUE: the wolf will teleport to you while the world is loaded

Note: if you save the game close enough to wolves they don't teleport

Here you can find a saved game just before the bug happens https://drive.google.com/file/d/1-kVG6zXEqyt3jzEN6OsvdtcNwgRe_wKB/view?usp=sharing