As you can see in this image amethyst geodes can cause floating grass/moss carpet and tall grass upper part without the bottom part.
I assume this could also lead to creation of floating azalea bushes dripleafs and etc

How to reproduce:
Seed: -8508883206669806165 (lush caves single biome)
Location: /execute in minecraft:overworld run tp @s -22.35 -45.95 161.43 -433.42 44.05

Note: because of MC-219200 you might need to creating this world multiple times before you get this version of this world