Map Editor: Maps set to legacy after 2.0; then when changing to the proper format, they report an error when trying to test

Not sure if this effects all maps but I experienced it with a MPD map I have been making.  The map was set to MPD about a week ago when I first created.  Today (Saturday, May 5), when I went to test it, it told me mightyscript wasn't allowed.  I verified the map settings and the map was set to Legacy.  So I changed it to MPD.  When I tried to test it, it said that key features were missing (ie. heart, toybox, etc).  I deleted the toybox switch/gateway and player1's heart, then replaced these items.  When I went to test again, it said mightyscript isn't allowed... and the game mode was reset to Legacy.