Wandering trader llama continues to attack an imaginary enemy after putting difficulty peaceful

In my creative world, i spawned a vindicator, and i put difficulty peaceful. But, the llama still attacking him even if he doesn't exsist anymore.

What I expected to happen was...:
That it would stop attacking.

What actually happened was...:
It continued attacking.

Steps to Reproduce:
1. Find a wandering trader and his llamas;

2. Spawn a vindicator;

3. Wait for the vindicator to attack the trader;

4. Stop the game and put peaceful;

5. Go back in the game.