Lofty peaks and stony peaks are flat on large biomes worlds
1) Open a new world in 1.17.1 version with the settings "large biomes"
2) Close the world and upgrade that in 21w39a snapshot
3) Type /locatebiome lofty_peak or /locatebiome stony_peaks
4) Notice that the biomes have not peaks
Created Issue:
Lofty peaks and stony peaks are flat on large biomes worlds
1) Open a new world in 1.17.1 version with the settings "large biomes"
2) Close the world and upgrade that in 21w39a snapshot
3) Type /locatebiome lofty_peak or /locatebiome stony_peaks
4) Notice that the biomes have not peaks


Invalid, changelog said that blending hasn't finished yet
Large biome world types aren't even re-implemented on the current snapshot, so it is expected that this happens. Not sure if valid though.
Can confirm also this has nothing to do with biome blending
Fixed in 21w40a