Ultimatum / Simulacrum layouts

Hi, I was curios if anyone had information related to how Ultimatum encounters and sim determine what layouts / encounter you'll get?

I've run a significant amount of simulacrum between Affliction and Mercenary, and I've always gotten either lioneyes (most common), oriaths (least common), or forest encampment. I have never gotten any other layout but I have seen a couple other layouts in videos / on stream.

As for ultimatum, I think at this point in the league it's accepted that it's bugged and the vast majority of encounters are either survive or circles, regardless of Atlas points.

Would love to hear if anyone had any answers/speculation for either of the points above.

Ultimatum does have the option to influence them with the atlas if you wanted to.

For simulacrum the wiki says it is random. It's certainly possible to get them all. It's possible there is some sort of bias, but my guess is it is likely RNG. How many would you say you have done? More than 20?

The ones I've gotten more frequently in recent times would be. Lioneye's, Sarn and Dock. Goin back further I have got plenty of the other 2 as well though.