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I had the same problem and can confirm loading my save in v1.5 solved it. I had to advance all the way to unlocking the attic, but I was able to transfer my fixed save back to the newer version with the attic unlocked.

Thank you so much for the hard work you've put into this game! Tea for God and Beat Saber are the only reasons my VR headset isn't collecting dust, so you can imagine my appreciation :D