I made a custom modpack that includes most of the same mods for the adventure pack modpack. However, the area levels in the overworld are bugged and are only at level 1 even 500 blocks past the spawn area. How can I fix this? Sorry I'm new to modpack creation

Same, I've noticed this since one of the latest releases. Overworld area + mob levels don't seem to change anymore even flying out far in creative mode and I haven't seen the area level change past 1.

Im having the same issue as well.

highly possible i broke it on latest release trying to fix something else, will fix it soon, recommend using a previous version

When can we expect it to be fixed?

It was fixed