The game crashed when ever I try to start a new reign of giants world.
After doing some testing, if I edit the world gen to not include beefalo then it will work.
This happens with all characters and no mods.
Possible bug as mine aren't showing any numbers for how much filtration medium/ oxygen is being used and how much clay and oxygen is being emitted?
EDIT just realized it needed to be put in contaminated O2 not CO2 oops