Arm dispostion on entities when viewing survival inventory.

When on a ridable entity(ie, boat, horse, pig, minecart), in first person pov, when viewing your survival inventory(or inventory in survival) your arm "breaks" and it looks longer/weird.

Note: When viewing maps, the left arm is the "broken" arm, and it blocks some of the map
Note2: It seems to fix itself after viewing again off of an entity.