Oh no that's not a bug lol it's intentional, I dunno if you noticed ever but the vending machines for example swap positions or what items they sell, or the items swap suddenly, some rooms do that too, they disappear and then reappear
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Is it tied to collecting notebooks or does this happen randomly over time? I've been trying to turn off both generators in one run, being able to enter one Maintenance room at the start of the game, but the other Maintenance room seemingly never appears even after waiting a while and collecting all the notebooks... unless this is intentional too