The bug is not the fact that polar bears attack foxes. Just look when I hit a polar bear and the fox I spawned and see what happens after I hit them. Hint: look at the movement.
https://www.youtube.com/watch?v=XVlV_Y1XJrk&feature=youtu.be
Linked issues
Comments 3
Duplicate of MC-138550
Are you playing on a server?