Hello!
You said I should create a new issue for this so here it is :)
So I know the problem of few grasses floating on top of cavern entrance is already in Minecraft, but it updates and there is not that much. But with Biomes O plenty, project vibrant journey, quark and Terraforged, it seems that the decorations do not remove at all, they are always floating as if there was grass under them. Here are a lot of example (this happens with every cavern entrance)

I have not found a fix for this yet. Now that the carver is implemented as a feature, it seems it is not possible for other features to use the updated heightmap. Hoping for worldgen code changes in future versions of Minecraft so that I'll have the ability to fix problems like this and #56.

no fix so far ? sad .

no fix so far ? sad .

Can you be please mindful of what you say? These words discourage modders

I'm sorry . I've just said that it's sad , but glad you trying to fix it :c

Fixed with v1.1 in 1.16.4.

1.14 and 1.15 are no longer supported, and will therefore not be receiving this fix.