Edge of savanna plateau too high beside jungle

Hi,

I have found a problem when I walked new generated terrain - savanna plateau biome, and suddenly I came to its edge, where jungle was seen down before me. I stayed at Y=128 and jungle down there was something more than Y=63, which looks like savanna terrain generated some different way, I think like 1.17 version of Minecraft.

I play seed 7189465689473364810 and when I started playing this world, it was snapshot 21w38a. No problem with other biomes yet, it has been first savanna and first jungle I saw in 21w42a. I visited mountains, plains, woods, taiga etc. before and everything was well generated, until have found this.

Pavel