The issue is when I get to the world generation screen and try to generate my world, I get an issue relating to Datapacks, where it wont allow me forward, instead offering me to load the world in "safe mode" (which doesn't work, btw, you can click the button but it doesn't generate the world) or to "go back to the main menu and fix it manually.
In the Data packs section of the generation screen, its registering my mods, many of which are labeled as "incompatible: made for an older version of minecraft." But they're not, they're made for 1.16.4 or 1.16.5.