Like the title says, the dragon won't spawn. I've tried walking up to the bell tower in both creative and survival while she tries to spawn in but there's nothing. In vanilla, when the dragon is spawning (after crystals have been manually placed), there's a hitbox above the center of the island that contains nothing until the dragon appears. This is still present when the dragon tries to spawn with this mod, but after the "summoning ritual" completes, the dragon's hitbox does not appear and the existing small hitbox simply disappears and the portal opens with the egg on top. I've looked through the compatibility issues this mod has and I don't see anything in my mod list that could affect it, but here's the mod list on pastebin in case I missed something. Thanks!
(Note: I've never contributed an issue to anything on GitHub before, so if I'm doing something wrong or need more information, let me know ^^)

Edit: Forgot to mention that the end gateways are trying and failing to spawn properly. No gateway portal block, just two endstone walls.