Summary:
Using items on iron trapdoor works as if it was wooden (you must sneak to use something) while it should work without sneaking (like on PC version). Most likely it was caused by the way of making iron trapdoor: it was copied from wooden trapdoor and then the changes were made to it, so this feature was forgotten.

Steps to reproduce:

1. Place the iron door and iron trapdoor.
2. Try to use item while looking at the door and trapdoor. 

Observed results:
An animation of the hand will play as if this trapdoor and the door can be opened. And the items are not used.

Expected results:
The item will be used.