Sometimes trapdoors show the opposite side of themselves through the small windows. Other times they have no backside. I would think this is a bug 'cause it only happens sometimes.
MC-43989
trapdoor dubble inside texture
Resolved
Duplicate
0
(Unassigned)
Unconfirmed
texture, trapdoors, visibility
Minecraft 1.7.1, Minecraft 1.7.2, Minecraft 1.7.3, Minecraft 1.7.4
Retrieved
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]) here.