Named maps lose their title after copying

An anvil was used to rename a map (it was called "Local Map" (I don't know if this matters, but again meh whatever )). An empty map was made and both maps were put inside a crafting table for the copying of a map to proceed. Two maps came out named "Map #3" (or something). The point is the name "Local Map" was lost in the process of copying and more levels had to be spent on renaming the map again which is annoying...