FF6LE Rogue CE / Zone Doctor CE

I've attempted to put a Message Name on a dummy map ($10B) and even if the Exit Field that lead into that map has Show Message enabled, no message is shown. Do you have any idea why? My theory is that since it's a dummy map, many elements (strings?) are missing and Message Name is one of them. If that's the case, maybe there's a flag somewhere? Otherwise new maps wouldn't be able to show a Message Name either.

Edit: I tested both expanded and not-expanded, same thing. Tested with v0.2, v0.3 and v0.4a.