Before 20w17a I used to spawn in a soulsand valley with the other biomes very close to me, I  used to be able to find an equal amount of the old and new biomes in the nether. Now i generated the seed again in 20w17a and now i see soul sand valleys occasionally and large nether wastes and basalt delta biomes. It seems that the nether forest biomes are sparse out now seperated by large nether wastes.

PS: I tried this with multiple worlds,

This change is not mentioned in the changelog. Here's a pic for example of my spawn in 20w16a and 20w17a.

Please revert back to the original nether biomes generation! Thanks