Sudden issues with worldgen datapack

Heya, so basically I have two blocks that are duplicated—aloe vera, to be specific. Both mods have worldgen JSONs that I can reference; but unfortunately, when I attempted to edit the JSONs, I get an odd "invalid player data" issue.
Here's what I've attempted so far:

Create my own configured feature data in data/mypack/worldgen/configured_feature (two files)
Replace the JSON data of the mod with the aloe which I want to replace in data/biomeswevegone/worldgen/configured_feature/aloe_vera.json
Replace the JSON data of the mod with the aloe that I want to spawn in data/biomeswevegone/worldgen/configured_feature (two files)
As for the error itself, it looks something like this:

[08Jan2025 08:30:42.954] [Server thread/ERROR] [net.minecraftforge.eventbus.EventBus/EVENTBUS]: Exception caught during firing event: Trying to access unbound value 'ResourceKey[minecraft:worldgen/configured_feature / bloomingnature:mangrove_swamp_cattails]' from registry net.minecraft.core.MappedRegistry$1@6fe64839

After which I immediately log out due to "invalid player data".
(on a separate note, I don't actually know why that feature in the log is erroring—it's a placed feature that I edited, not a worldgen one
also, I'm adding this data via KubeJS)