Holding right mouse button rotates camera straight down

Long version

Whenever I hold the right mouse button for a second (eating, aiming with bow), the camera (first person view) turns straight down. It also rotates around the vertical axis to the right at some non-simple angle (not 90° or 45°) in the next quadrant.

 I remember having this happen in the past too.

I just installed 1.14.1 and 1.14.2 versions and I can reproduce immediately there (new world created). But it was not happening in 1.14.3.

Short

I hold down the right mouse button for over 1 second. 

What I expected to happen was...
Normal actions not being 'interrupted'.

What actually happened was...

The first person camera rotated straight down. It also rotates to the next quadrant to the right, at some specific angle.

Steps to reproduce

• Start a 1.14.4 game (I only tested survival, but doubt that's of influence).

• Hold down right mouse button

System

• Windows 10

• AMD Ryzen 2600X

• AMD Gigabyte Vega 64