Upside down view when saddling

View goes upside down while applying saddle to horse

I just expected the saddle to go on.

The saddle went on, but my view went upside down until I exited.

Steps to reproduce:
1. Tame a horse.
2. Ride the horse.
3. Enter the inventory and add a saddle.
Then, the view is upside down.
There is a screen shot attached of an example.