java.util.concurrent.CompletionException: net.minecraft.util.InvalidIdentifierException: Non [a-z0-9/._-] character in path of location: minecraft:DUMMY
at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314)

Getting some crashes after I restarted the server. In AOF discord I posted images of this working with overworld land gen, and the surface was End Stone and End biomes. Did not have any crashes flying around. Then I left the server while still in the dimension, and did /stop on the server. just started the server back up and then when I tried to join, the server crashed with this same error. I then edited my player data to change my position to be in the overworld. Started, Joined fine, then tp'd to the new dimension which worked without crashes this time. However I noticed it was not End Stone on the surface, it looked just like my overworld. opened my map and saw End Stone stuff I had been to before, and went there. there was chunk borders between the End Stone and overworld gen. I then started to travel and it crashed again.

I am guessing its either not saving the generation settings it was created with, or something caused it to change when I stopped and started the server. And I'm sure that change is causing the issue, as I flew around for a good while when I first created the dimension, and had no issues until I stopped and started the server.

Yarm mapped Crash Report
https://paste.alloffabric.com/equweluwow.yaml

I believe you resolved this, or it did not crash again, but seeing as its been working fine on AoF4 public server since the Oct2 Commit just fine, and was working before that as well, its probably time to close this issue so others do not think it is still a problem.