when in spectator mode you can right-click on mobs to see there view. I had the debug pulled up and when I went into a creeper, spider or enderman, the debug it said 'Could not find uniform named InSize in the specified shader program.' Also, any mob I went into, the camera always faced the same direction no matter which way the mob was facing.
Hope you can fix it!
QWERTY
Please put only one bug report in each ticket. It is very difficult to keep track of bugs when they are not in their own tickets, and it is easier for you to make multiple tickets than for the mods to separate them.
And please use the search function in the future as all of the issues are reported multiple times.