When using the following dimension_type template the custom dimensions wouldn't load in 1.16.2, with the error "WorldGenSettings: Failed to parse buildworld:dimension_type/hell.json file: buildworld:dimension_type/hell.json"

 

{ "ultrawarm": false, "natural": true, "piglin_safe": false, "respawn_anchor_works": false, "bed_works": true, "has_raids": true, "has_skylight": true, "has_ceiling": false, "coordinate_scale": 1, "ambient_light": 0, "logical_height": 256, "infiniburn": "minecraft:infiniburn_overworld" }

 

I also tried it with "1.0" and "0" at "coordinate_scale", thats the onliest what changed in 1.16.2