Structure does not generate.

I am overwriting the structure files of the datapack towers of the wild reworked.
My datapack overwrites certain files of totw_reworked.
For example I reworked a structure file and placed my ocean_tower_bottom.nbt file in structures/ocean/.
Testing it out in a world worked and I could see my reworked structure. Yet after I made some changes to worldgen/structure/ocean.json, the structure did not generate any longer.
What I tried there is to change generation from heightmap to using a height range. What perplexes me the most is that these settings work for another structure of mine but do not work on this one. 
I removed 
  "project_start_to_heightmap": "OCEAN_FLOOR_WG"
hoping that it would make it not rely on heightmap anymore and I changed the start_height from constant to uniform with min and max below_top