The old Mountains biome, also known as Extreme Hills, only generates in tiny patches now, with only a few examples being big enough to be noteworthy.
During the experimental snapshots Henrik mentioned making them more "extreme," and thus they now generate in more extreme terrain like shattered savannas. However 90% of the time the shattered savannas completely take over along with other normal biomes, leaving the old mountains/extreme hills in small micro patches.
Note that most old mountain/extreme hills are like this, it isn't a rarity like normal microbiomes. This creates patches off blue cold grass and snow among usually other non-snowy biomes.
What I expected to happen:
Extreme hills/Old mountains to generate with the size of other biomes.
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@Chava. Microbiomes were mentioned to be unavoidable sadly during the experimental snapshots from Henrik, so I know that that's intended. But in my experience extreme hills in particular seem to gravitate much closer to the tiny side in nearly every instance, with a decent sized extreme hill being a rarity instead of the norm
Yes, they're unavoidable, that's why i think a general issue resolved as WF or WAI for all those microbiomes might be better than a lot of different issues laying around (what conditions would be considered for it being a "microbiome"?).
In my experience, the size really varies on how i found extreme hills. Although what i have seen are pretty small deserts and shattered savannas, so maybe i'll make a bug report about that.
Anyways, i probably can confirm this issue, but some other people might find decent-sized mountains pretty often and not experience this.
The thing is, pretty much every biome now doesn't have a "minimal" size, so this can occur randomly. I myself have found big, small and even extremely tiny extreme hills generating.
There should be a ticket for all general biomes generating as microbiomes and see what's the statement on that.