Hello,
A group of friends and I made a server containing the Origins mod, along with some other origins related mods, such as Pehkui and ExtraOrigins. We just recently began adding datapacks, and we haven't had any problems with them until we added a dragon origin datapack yesterday for a friend. After the addition of that datapack, we were unable to go to the nether or end dimension, and the dimensions didn't show up in the autocomplete tab when typing the command "/execute in". The only world that appeared was minecraft:the_overworld. I attempted to transfer the DIM1 and DIM-1 folders into the world folder, where they should go, and then I uploaded the world file with the new DIM folders in it, but the nether still didn't exist, and only the overworld appeared once again. The datapacks that we have, along with the dragon origin that we removed after the nether broke are provided.
The nether and end problem only began after we added the dragonborne datapack. We've had this problem before with other datapacks and I've been able to fix it with a world upload, however, the last world download I have is from a few months ago, before some things were built.
If there's any way to fix this, please let me know. I can provide a folder of the current world, if needed.