Just beat the enderdragon within BMC4, and it spawned in the middle of a premade structure. Tried right clicking it and I immediately got a crash. It was above the normal portal, so bedrock.
crash-2023-11-30_03.40.26-client.txt

Forge: 47.2.8
DML: 1.1.5.b3

This should be fixed in the upcoming 1.2 update. stay tuned