So the bug appears if you go into 3rd Personview and go all above your player.
Facing : -90.0 and 90 after that you can`t properly move around your player the camera starts to get lost and goes to a like snaping mode.
Here a Video for a better explanation : https://www.youtube.com/watch?v=4h9zFoTHnFg
Environment
CPU : Intel Core i5-3470
GPU : Nvidia GTX 750 Ti
RAM : 12GB
SSD : Samsung 840 Pro 128GB
OS : Windows 10 64bit Version 10.0.17763 Build 17763Version 10.0.17763 Build 17763
Java : Java Version 8 Update 201 (Build 1.8.0_201-b09)
Thank you for your report!
We're actually already tracking this issue at MC-145668, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.