Depending on the resourcepack (In my case I'm using 8-bitcraft 2) The latest version of better foliage for 1.16 will fail to use the generated textures for grass at all and even when it does it will often fail to use any resourcepacks textures. Also depending on the resourcepack some trees will have better leaves and some won't and in some cases none will. This is unlike older versions of better foliage which would automatically detect a resourcepacks textures without issue.