Leaded llamas keep spitting at the player when they switch gamemodes

Llamas that are leaded (e.g. attached to a fence or by a mob/player) will continuously spit at the player when they are attacked even when the player switches gamemode. This doesn't happen with any other mob or when the llama isn't on a lead.

Relates to MC-208315, MC-215097, and MC-154053

Steps to Reproduce:

1. Attach a lead to llama and attach it to a fence

2. Attack the llama in survival mode

3. Switch your gamemode into Spectator or Creative mode.
   ❌ The llama continues to spit on you while you are not in survival mode