AiMPRON

I opened a report, but I didn't find that it was already discussed

You can reproduce it by using a leash on a llama and hitting him.

When spit loop starts, u can stop it by either stretching the leash (by running away) or by removing the leash with right-click on the llama.

Without the leash, the llama will never spit endlessly. That's also why it can happen with a wandering trader, hit a llama once and it will stop spitting only when the trader, by running away, stretches the leash enough to make the llamas follow him.

By my thought, this is not intentional.

Here's a 1.16.5 reproduction that I did 

I opened a report, but I didn't find that it was already discussed

You can reproduce it by using a leash on a llama and hitting him.

When spit loop starts, u can stop it by either stretching the leash (by running away) or by removing the leash with right-click on the llama.

Without the leash, the llama will never spit endlessly. That's also why it can happen with a wandering trader, hit a llama once and it will stop spitting only when the trader, by running away, stretches the leash enough to make the llamas follow him.

By my thought, this is not intentional.

Here's a 1.16.5 reproduction that I did