Excessively high altitude causes player model to get stuck
I went up to the very top of Heaven on High (the Ruby Sea one) with noclip and turns out the z coordinate gets so high it breaks something and causes you to remain stuck way outside map boundaries.
The revert button loads back into the innroom, but causes an immediate teleport well outside normal boundaries. It is impossible to move even with noclip or teleports at this point (I turned noclip off for a bit after getting there to have a standing screenshot. May or may not be related to issues with if not activated on solid ground). Given I don't known what will happen if Hyperborea is turned off at this stage, I ended up having to restart the game.
An attempt to load into Limsa even with the coordinate override was fruitless.
Might need to restrict max height in this case
May have been an overflow somewhere in the coordinate system. The teleport to coordinates selection was showing a z coordinate below -700, which doesn't make sense. I wasn't paying attention how the autofill is determined tho.