Can't remove map name through a cartography table

Steps to reproduce:

1. Rename a map in the cartography table;
2. Place the map there again and erase what you just typed.

Expected results:
The map should have its name removed and go back to "Map 0" or something like that.

Observed results:
The map name remains, even though it can be removed by doing the exact same thing with an anvil instead.