What happened?

It looks like this mod breaks world height map in The End dimension.
Mod changes WORLD_SURFACE_WG heightmap and generation thinks that there is a surface at Y: -1.
As a result, it leads to a problem that structures can be generated in the void.

I've used additionally test mod to generate structures with default minecraft:jigsaw structure type.

Structure generation without BetterEnd:

Structure generation with BetterEnd:

BetterEnd

4.0.10

BCLib

3.0.13

Fabric API

0.90.7

Fabric Loader

0.14.21

Minecraft

1.20.1

Relevant log output

No response

Other Mods

AdoraBuild: Structures

Btw, this seems to be related similar issue: #274