What I expected to happen: with plenty of new biomes in the game, I hoped each of them to be unique, or to have some unique features. It works for most new biomes but not for all. Some of the new biomes have no unique features, and some of them have them only in theory but not in generated worlds.

What actually happens: the world generator must have non-perfect procedures, as some of biomes do not differ from others. Namely:

• there are still lakes/ponds on Desert (the simply desert, not Desert M),
• there are Desert M biomes with no water pool at all (so they do not differ from Desert biomes),
• differences between Jungle, Jungle Hills and Jungle M may be minimal or virtually not present, as Jungle can be enough hilly, and some Jungle M areas can be less hilly than Jungle Hills.

How to reproduce: just have a look at different jungle and desert biomes on various maps. You may check the seed -435130594162764786, coord. X=-280 Z=5550. There is Desert M there (and in the nearby area) with not a smallest pond and quite high sand hills instead (not expected on Desert M and not Desert Hills). There is no Desert Hills in the vicinity.

A pond on Desert (not Desert M!) is at -282, 5660 on the same map. There are also two ponds nearby on the border Desert/Jungle Edge.

Jungle, Jungle Hills and Jungle M biomes are close to that place - be smart enough to find a difference between them three!