well i was messing around renaming stuff in creative and realised that if you rename a chest or trapped chest it not only changes the name but changes the gui name too so i decided to rename an ender chest - it changed the name but not the gui name. so hopefully you will fix this bug.
(if it is a bug that is)
Duplicate of MC-7559, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.