Using a small map, abundant habitable and abundant extreme planets. Total of 40 +-5 habitable planets, half of them are extrene.

Same map, Abundant habitable and rare extreme planets. Total of 40 +-5 habitable planets, about 5 are extreme.

I tried this several ways (common, occasional, etc.) always using the small map. The conclusions are...

As already noted, the abundant setting bug is fixed, it now gives you the most habitable planets, abundant + extreme

Choosing abundant extreme planets does not give you more planets it just increases the percentage of extremes. With both on abundant you get about half normal and half extreme. In my example of a small map, about 20 of each. In my small map example of abundant habitable and rare extreme, you still get the same 40 planets but only 5 are extreme.