When creating a larger version of a map by placing 8 paper around it in a crafting table, if you shift-click it back into your inventory it subtracts the 8 paper but leaves the map at the same size.
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Duplicate of MC-87 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.