I think I'm stupid and can't make a project: Worldgen won't function for dimension features.

I am really tired of feeling like the only idiot here who knows nothing about datapacks. With how many help tickets I've made, anyways I made a custom dimension with a custom biome, it worked, but I wanted to add my own features so I wrote what I thought should be the appropriate name space and it won't work. I'm trying to tell the game to find beanstalk_isles:petals, beanstalk_isles:blossom_tree and beanstalk_isles:short_flowers from the dimensions biome folder in worldgen under the custom name space beanstalk_isles It says those features can't be found?