1. When your mod is installed with Nullscape, the portal in the end does not appear until the dragon dies. Once the dragon does this, the portal will apear with most of its bedrock blocks missing. It looks weird.

I have informed the dev of nullscape. Any idea why your mod (or theirs) causes this issue?

2. When generating your world for the first time in the menu, the generation box will be off centered, this indicates some type of generation issue in vanilla usually but since nothing has occurred during testing in modding I am assuming it is not a actual issue and just a visual bug.

Closing issue, turns out it was not this mod. Apologies