Player moves when llama is tamed. This does not apply with any other mob.
How to reproduce:
Spawn a llama
Tame it
Observe the player moving when the llama first gets tamed
Observed Results: The player moves when the llama is tamed
Expected Results: The player should not move when the llama is tamed
Fixed in latest beta, as stated in changelog: https://www.minecraft.net/en-us/article/minecraft-beta-1-18-0-22