Glitch with maps that have signs. Loading a chunk with a sign makes it say "Unable to locate sign at X, Y, Z" The signs are still there, but blank. Happens on SP and MP. Relogging in the area of chunks fixes it.
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kumasasa
Duplicate of MC-3564 , please use the search function to see if your bug has already been submitted. Currently over 35% of tickets are being closed as duplicate.