Maps in item frames can sometimes appear NON-seamless

1.2.13release3

Summary:
Maps in item frames are intended to show seamless textures. But sometimes when you log in they have a seam between them. This effect persists permanently in the world even after relogging and reloading. The only way to fix it is to try reinstalling the map. What's extra bizarre is this only seems to affect the maps in the lobby when you first load in. The maps in our credits are fine.

Impact:
Ugly visual in our lobby.

Repro:
Load a map in an old world. Then load one in a new world.

Observed results:
Attached

Expected results:
No white lines.