When you look away from an Item frame that has a map in it (not fully away, keep the frame in the corner of the screen) the frame and map disappear. Looking at the frame again causes it to reappear.
MC-39086
Map In Item Frame
Resolved
Duplicate
0
Ethan John Heims
(Unassigned)
Unconfirmed
Minecraft 1.7.2
Retrieved
I can confirm this running OpenJDK on Ubuntu 14.04.
I assume the (smaller) hitbox of the Item fram is used when determining whether to display it or not. This causes a problem, because the map (which is a child of the item frame) is larger than the containing frame.