The bug
While exploring on the latest snapshot I found a large patch of land with cyan-ish grass and no tall grass. I found out that the biome was set to river.
How to reproduce
Generate a world in 22w11a with the seed -1402115029054436671
Run
/execute in minecraft:overworld run tp @s 715.26 80.17 1217.32 -292.35 35.55
Open the F3 menu
In front of you should be a large zone of grass with the
minecraft:river
biome
This ticket may duplicate MC-200960, if not, then it's related to it.