generation error from possible overlapping

when i opened my survival world to check bugs that might have occurred, i found some floating Jungle and Oak leaves somewhere near my base, as well as vines. some parts of a nearby ravine also showed some of the glitch in generation.

my world was generated some time in late February this year , on the late 1.16 beta.

Screenshots Attached: floating leaf and vines, weird water wall block, water seems to be from 2 different biomes, may be caused by a supposed overlap of old and new world generation

Edit: I can confirm that this is a supposed to be overlap that i may have triggered by changing my render distance from 7 to 6 (the recommended render distance) then back to 7

Included screenshot of the same coordinates from the same seed (coordinates from one of the screenshots)