I managed to reproduce this on 1.13.2. Seed: 3097946827751441825 Double dungeon XYZ: -2607 31 3319
Observe that the second spawner has been replaced with cobblestone.
Important note: this dungeon does not generate as a double dungeon if you directly /tp to the coordinates. I can verify the double dungeon spawns on a fresh world when teleporting to -2572 31 3275 and then moving to the dungeon coordinates specified above. There seems to be a quirk where teleporting directly into the ungenerated chunk can influence the dungeon generation.
Jack Cusack
I managed to reproduce this on 1.13.2.
Seed: 3097946827751441825
Double dungeon XYZ: -2607 31 3319
Observe that the second spawner has been replaced with cobblestone.
Important note: this dungeon does not generate as a double dungeon if you directly /tp to the coordinates. I can verify the double dungeon spawns on a fresh world when teleporting to -2572 31 3275 and then moving to the dungeon coordinates specified above. There seems to be a quirk where teleporting directly into the ungenerated chunk can influence the dungeon generation.