Zombie evolution speed (no noticeable evolution)

I haven’t played much for about half a year or so. Now when creating new worlds (in the latest experimental) I’m using the same setting of 4.0 for zombie evolution scaling factor as I always did — but there is no noticeable evolution (for 40+ days as far as I can see).
It really makes me wonder what’s going on. Do I have to enable it or something?

Using default options you won’t see evolved zombies start to appear until day 50-60.

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