Some seeds can spawn the DimDoors dungeon portals on the spawn island. It should be possible to blacklist the overworld in the config or drop the generation chance to zero if this behavior isn't intended.
We've tried to fix this before. The config option in DimDoors is bugged and disabling them from spawning in any dimension disables them completely. It's a fairly rare occurrence anyway.
Some seeds can spawn the DimDoors dungeon portals on the spawn island. It should be possible to blacklist the overworld in the config or drop the generation chance to zero if this behavior isn't intended.
One such seed is -472742362868097766