As per the title, this mod's are missing from #forge:seeds, a tag which contains all seeds and seed-like items used to plant crops, like Farmer's Delight rice. This tag is notably used by Create: Crafts & Additions in its seed oil recipe.~

The seeds that should be added to the tag are
culturaldelights:cucumber_seeds
culturaldelights:eggplant_seeds
culturaldelights:corn_kernels