Once you destroy a door at its bottom, the top is briefly shown as open.
Linked issues
is duplicated by 5
MC-2041
Half door Bug
Resolved
MC-51297
Glitch When Breaking Bottom Half Of Door
Resolved
MC-58810
Door destroyed appear again and disappear
Resolved
MC-69588
When destroying the open door, it is first closed and then destroyed.
Resolved
MC-74945
When breaking iron door, it opens then disappears
Resolved
Attachments
Comments 6
Can confirm this for a split second (probably one tick / frame)
But this looks quite unfixable / working by design at the moment since the facing and the open/close state is stored in the bottom half of the door: http://minecraft.gamepedia.com/Data_value#Door
Maybe that behaviour will change in the future when the 4 bit data value is replaced by something better.
Jens Bergensten
Found some other odd behavior with destroying the bottom half of doors:
place the door on a single block facing any direction but WEST
destroy the bottom half of the door and watch how the top part briefly teleports to the WEST.