Biome not configured to generate in Overworld caves still generates underground at bedrock level and not on the surface.

I have a biome set to generate in the Overworld, on the surface, it is not a cave biome, I did not check the "Generate biome in overworld caves", I only checked "Generate biome in overworld", I did not add a Depth value to it. It generates at the bottom of the world as a cave biome.