When I go to the LostCities customization screen everything is blanked out and when I try to load into the world it doesn't generate cities.
In 1.19 if I try to list parts it just says that the dimension is not supported.


in 1.18 it can't get past world generation, so I guess this is an improvement.

Did you try clicking the button that says 'Disabled'?

Oh, thanks for pointing that out. I don't know how I missed that.