do you think anything interesting would happen if someone died on their questbed and crypt at the same time? Like, Godtier^2?

They’d only ascend once. The Quest Bed warps the Dream Self to the Battlefield, where it ascends. The Crypt Ascends the Real Body or the Dream Self on the spot. If the Crypt Ascension kicks in first, there’s no un-ascended body to Ascend. If the Quest Bed Ascension kicks in first, the Dream Self is warped to the Battlefield where it Ascends normally.