> What kind of RL pressure cooker creates this behavior?

The one LessWrong-adjacents have been warning about for a decade or two before this was possible:

Instrumental convergence.

Goes long before LessWrong, from 1960s:

> The magic of automation, and in particular the magic of an automatization in which the devices learn, may be expected to be similarly literal- minded. If you are playing a game according to certain rules and set the playing-machine to play for victory, you will get victory if you get any- thing at all, and the machine will not pay the slightest attention to any consideration except victory according to the rules. If you are playing a war game with a certain conventional inter- pretation of victory, victory will be the goal at any cost, even that of the extermination of your own side, unless this condition of survival is explicitly contained in the definition of victory according to which you program the machine.

> ...

> In short, when there is a war game to program such a campaign, there will be many to forget its consequences, to ask for the £200 and to forget to mention that the son should survive.

> While it is always possible to ask for something other than we really want, this possibility is most serious when the process by which we are to obtain our wish is indirect, and the degree to which we have obtained our wish is not clear until the very end. Usually we realize our wishes, inso- far as we do actually realize them, by a feedback process, in which we compare the degree of attainment of intermediate goals with our antic- ipation of them. In this process, the feedback goes through us, and we can turn back before it is too late. If the feedback is built into a machine that cannot be inspected until the final goal is attained, the possibilities for catastrophe are greatly increased

https://monoskop.org/images/1/1f/Wiener_Norbert_God_and_Gole...

Most of the same is in some 1950's revisions of his earlier books.