Cinematic camera activates at dismounting a horse

What I expected to happen was...:
While playing survival, and after changing FOV value, i expect the mouse settings not to change.

What actually happened was...:
After that, the cursor reacts slowly to the mouse (doesn't have to do with sensibility, it's different), and keeps moving after i stop the mouse, making it very difficukt to play properly.

Steps to Reproduce:
1. Create New World (seed: bertoesunchicomuylishto )
2. Bred a horse and mount it with a saddle
3. While in the horse, change the FOV value
4. Dismount the horse
5. The bug appears, and no setting change resolves it