**Did a search for enderchest and listed by created and didn't see this listed**

After opening enderchest, it continues to open and close behind the inventory grid while it is up. Though only one sound event is triggered on the initial opening of the chest. 

Thought it might be a product of lag during a rain storm but continued to do it after the rain storm. Toggled weather off and on and was able to reproduce the bug in animation. 

Did some more testing. Regular chests open just fine. 
Enderchests have the following behavior....

open and continue opening and closing animation
make open sound trigger, but no animation.
make open sound trigger, shortened opening animation with no closing animation just shows the chest closed while still in the inventory grid.