1-When the world is generated, lakes, rivers, seas, oceans, among others, are also generated, but the bugs are that, when generating these water junctions, there are buggy places where water cannot pass and it is strange, normally it should flow through this hole, however, it does not pass and it seems that it has a barrier preventing the water from passing, I hope you understand this Bug and fix it because it is strange.
2-In the world's generation, some grasses are floating in the air.
These bugs also happen in 1.16.2.