When i installed this mod, it removed all the oceans from Aquilo, turning the planet into large open snow areas and frozen lakes.
After i disabled it again Aquilo returned to normal, Any idea what caused this?

That is an issue from cold biters, and my side includes all the fixes that I can put in for that. :/
It is dropped from the rework because of these.

Thx for the response, after a bit more searching, i had also found that it was the cold biters ''Lemures only'' option that didnt disable the aquilo generation overhaul, like the Nauvis only option
The only solution until that mod fixes itself, is disabling Dea Dia when i reach aquilo, and generating a large chunk before i can reenable the mod, then try not to generate more chunks for the whole game

The New update for Cold Biters Fixed the problem by making it a manual toggle to change Aquilo, Problem Solved : D