Note: I spent over an hour to search if there was already a report here on the tracker. Apologies if there is an older one but i just couldnt find a ticket with the same issue.

So there seems to be a notable latency with the mouse response in the latest beta. This affects camera movement in gameplay and even hovering through items in the player inventory and even through the game settings.

(The mouse settings in my laptop are the exact same before and after i updated and there was no issue in the previous update)

 
The bug as observed in the inventory
Minecraft 2020-09-06 18-11-37_001.mp4

 
The bug as observed in the game settings
Minecraft 2020-09-06 18-08-37.mp4