Now I know this mod is very early on in development and I wouldn't be surprised if this issue gets closed until it matures. But I just wanted to report an issue I had.

I'm running this mod and the Aether mod together however no longer how long I leave Minecraft running for any chunks beyond the vanilla render distance (in this case 16 chunks) will not render until vanilla dimensions. I dunno if this can be fixed, but the Aether's code is open source if you require something from their repo.

Video with issue (sorry for resolution):
https://www.youtube.com/watch?v=0rTi8q0zm2U

Aether repo:
https://github.com/Gilded-Games/The-Aether-Archived

fp2 does currently have some issues with dimension switches, even to vanilla dimensions like the nether or the end. while this is probably related, it is interesting that the game didn't crash, which leads me to believe that this could be something else entirely. will investigate.