We have confirmed that some other queries can have the same behavior.

It may be similar to the previously posted MCPE-120005.

But the query is different, so I created a new ticket for the time being.

Steps to Reproduce:

1. Please Enable this Resource pack.

2. Switch First person to Third person

Observed Results:
There is a slight delay. It looks as if it is updated every 2 ticks.

Expected Results:
You must always be facing the camera, as it was in 1.12.1 and earlier.

Player animation has nothing to do with it. However, I created a resource pack to make it easier to understand the bug situation.

If you sneak, the "head orientation" will be strange, but this time it doesn't matter, so don't worry. It does not occur in vanilla.

There is a lag in query.head_x_rotation and query.head_y_rotation.

I tried writing (query.head_y_rotation --query.body_y_rotation) to reproduce query.target_y_rotation, but there was a bug that didn't exist in query.target_y_rotation.

I think this is a bug that significantly reduces the freedom of resource packs.

Test Video: https://www.youtube.com/watch?v=FZkMf9yfWuI