If an instance has both Embers and a mod that lowers terrain height like Tectonic, the ancient ruins will spawn floating in the middle of the ocean. Not a huge problem, but it looks kind of ugly. It could be fixed if a config option was added for the max height of the ruins. That would be pretty RAD of you. ;)

you can use a datapack to change the max height that the ruins generate at, you just have to change this value.
Though I just had an idea that would allow the ruins to always spawn lower than the bottom of the ocean even if a mod changes it, so I guess that will be in the next update.

Thanks!

In version 1.2.0 the small ruins now spawn relative to the bottom of the ocean which should work even if another mod has a biome with a lower ocean floor.