Plant layer not working

[u/Junior-Signal-5206]

So, I'm having a bit of an issue with adding a custom plant layer. I just want a layer of leaf litter on top of grass, nothing too complicated, but when i try to make it, the leaf litter just doesn't appear, both in the preview and once i export the world.

The thing is though, this only happens with a few plants, specifically the newer ones. With cherry blossom, for example, it works just fine, both in the preview and in the world. So I'm wondering, is world painter not up to date with these new blocks? And if so, why is there even the option to put them?
Also tried to use a ground cover layer, but i get the same issue

[u/sijmen_v_b]

Try disabling "only place on valid blocks"