Noticing that bo3 structures are way more common than in 1.12.
Will update this issue once ive made a test preset.
PG85 commented
For 1.16.5-0.0.15, added UseOldBO3StructureRarity to the worldconfig, disabled by default. Enable to use 2 rarities, one from the CustomStructure() tag and one from the BO3 file.