Importing custom dimension settings with default-style tags causes crash on world generation

Please feel free to change the title if not understandable.

I made a custom import settings file (attached) which creates a new dimension, named "second_overworld".  The settings for that dimension are a copy/paste of the settings defining the normal overworld, but with a different seed.  Importing that settings file at world creation shows no errors, but the game crashes during the generation process (crash report also attached).

The expected behavior would be that a new dimension would be created that would generate in the same way to normal overworld does, but using a different seed.  It would be unexpected to have to completely replicate overworld generation using (many many) generator and biome tags.