So originally i was doing this with other mods but basically I can't seem to add features to biomes. I can remove them but I've made the following to test with as few mods as possible:
{
"predicate": {
"type": "lithostitched:true"
},
"type": "lithostitched:add_features",
"biomes": [
"minecraft:plains",
"minecraft:savanna"
],
"features": "minecraft:trees_jungle",
"step": "vegetal_decoration"
}
This results in the game crashing when it tries to generate chunks (creating a world or moving around in one)
Mods list:
Architectury 9.2.14
Lithostitched 1.4
KubeJS 2001.6.5-build.16
Rhino 2001.2.3-build.10
I am able to add features by copying biomes out of a mod's jar and editing the biome's json file individually, but not via lithostitched

I've tried it without the predicate as well, either way crashes it

if it matters, I am using the minecraft\kubejs\data folder, maybe there is an incompatibility with that so I'm going to try figure out other means of loading the changes to see if that changes anything

I tried with global packs and it didn't crash, but also didn't work either, but then using forge:add_features and changing the lithostitched folder name to forge that works and gets features to place

Can you send the crash report from the original issue?

crash-2025-03-26_02.55.28-server.txt

Ah, feature order cycle crash. Adding vanilla features via biome modifiers is prone to causing crashes due to features being out of order. Make a copy of a vanilla feature if you want to add it to other biomes.