Hm-m-m. I'd love to say that this worked, but alas, no such luck

The Qubbat as-Sakrah's still stuck in the Egyptian desert. As for some of the other structures that were in the sea, like Visby Ringmur, I can't find them at all anymore.
Edited to add: Well, it's just the damndest thing. In the interest of clean testing, I checked again with all extraneous mods disabled, and it turns out Better Looking Garbs somehow makes the Qubbat as-Sakrah migrate to the Sahara? I have
no idea why this would be happening.
To be clear, the problem with the structures missing is still there with all other mods disabled. It's just that when Better Looking Garbs is turned on, the Qubbat as-Sakrah is the only one to appear... but in the Sahara. So weird.