Default name is alot longer than the max name length.
You can change it in www/data/Map004.json, line 2412. Just change the 4 to whatever max length you want for the name. I attached a file with a max length of 10.It's because the original name is 4 Japanese characters. I need to figure out how to change the max length of that somewhere. I don't think it has any trouble with the default name tho.
If the file changes in an update you can search for "code": 303, it corresponds to the name input command.