The bug
The spawn protection (spawn-protection=16 in server.properties) will not work in all situations.
A non-op player can, by pressing the left mouse button on a item frame with, for example, a diamond sword. Both the frame and the sword will be dropped an can be picked up.
Also affects paintings.
Linked issues
is duplicated by 4
relates to 4
Comments 38
Spawn protection is not available for signs and item frames, just like animals and mobs. This is because as they do not fit into the cube alignment of the game, they are classed as 'entities'.
This is a known bug and can only be resolved through 'spawn protection' where entities (i.e. pigs) cannot be killed: This is an almost impossible task.
Confirmed, the text reappears on relog, but not with the item frame.