Spawner replaced with cobblestone in multi dungeon

When two or more dungeons generate together such that the wall of one dungeon intersects with the spawner of another, said spawner generates as cobblestone in the middle of the open space of the dungeons.

Steps to reproduce (outdated)

1. load seed 2795058148369038151 in Minecraft 1.16 or higher
2. bugged cobble/spawner is at -301, 46, 59