Latest Osiris lore grab shows that ya killing the Undying Mind has set all infinite forest futures to one where the Traveler dies and the Pyramid takes its place.
Not sure how, but this is apparently what we have to fix.
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I think it's because the player killing the undying mind was part of the darkness's plan. Similar to how it let us take the artifact and later wanted us to do the garden of salvation raid to track the signal. The undying mind started to be a problem around the time of the raid.