Question about random events in BTS

So when DO they change the RNG pool? How come going back 5 turns resets it? I wasn't getting the same thing every time when I went back to 1896 or whatever... but maybe I was doing something slightly differently every time?
 
I don't know all ,but combat and autoexplore do use the RNG ( and missionary usage too, I think ) .... I think that normal civ housekeeping normally don't use the RNG.
 
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