Prior to Outbreak, I could set up a set of Algae Terrariums and pipe water to where they were.
The water vent would be placed on the floor so that water would stop flowing at one tile height, and the bank of Algae Terrariums would happily produce oxygen.
Starting with Outbreak, this setup doesn't work any more. Terrariums in 1 tile of water claim they need water and don't soak up the environmental water, which stops oxygen production.
Steps to Reproduce
Build a bank of terrariums and pipe in water to a depth of 1 tile. Oxygen production stops.
Status: Known Issue
We are aware of this issue and have it logged internally but either we do not have a fix ready yet or we are not planning on addressing the issue in the immediate future.