(1.21.8) Resetting a realms world to a template called Harbor Town gives an error screen

DISCLAIMER: this is on 1.21.8. and i couldn't find a 1.21.8 in the “affects versions”.

INFO: it gives this ‘out of screen’ red text that has “azure_font” or something like that in it? i attached a picture of the entire thing so you could see it.