When the egg I had( a aether dragon egg) hatched the server crashed.
When I reloaded the server the egg was gone and the dragon wasnt there.
There was plenty of space to spawn and I have no clue why it happened.

Forge 47.1.0 has been released so that means DM:L 1.1.5.b3 will follow really soon.

Thanks for the patience

Great news, and thank you, @Kay9Unit, for your continued work on this project.

fixed with a55af4b

hotfix soon..

All Set.

I have the same issue on my installation as well. Let me know if you would like logs.

Same for me with the logs ask if you need

My debug log is attached.
dragon_crash-debug.log

no version, no logs, no environments... I need info. It's hard for me to diagnose the issue you open with just "it's broken."

So yes, please provide logs.

I might have a clue as to what's going on but yeah I need info.

Yeah, I figured.

So the issue is DM:L for 1.20.1 was developed with Forge 47.0.0
This is the earliest forge version for 1.20.1. However, every version up to the latest is still currently in its beta stage. This means theres lots of things that can change that will probably (and this case, has) break mods unexpectedly until the next recommended forge version comes out for that Minecraft version.

To be specific for this case, things have changed between 47.0.0 and 47.0.43 that DM:L did not expect and therefore did not like (thus it crashed)

The solution to you currently would be to downgrade your forge version if its at all possible.

I haven't made up my mind on if I want to make a quick fix for this or just wait until the recommended forge is released. Whichever comes first really.

I apologize for the inconvenience, but unfortunately this was to be expected on an unstable forge build.

@Kay9Unit works great, thank you.