The bug
Ruined portals can generate inside woodland mansions, likely setting them aflame upon rendering.
How to reproduce
Seed: -5224212233698293064
Coordinates: /execute in minecraft:overworld run tp @s 277 64 86Seed: -5224212233698293064
Coordinates: /execute in minecraft:overworld run tp @s 277 64 86
I can confirm a Ruined Portal did overlap with the Woodland Mansion the coordinates are /tp @s -4923 72 23843