Not sure if this is simply a Muluna 2.1 bug, or something Spaced Out did, but some fluids are no longer "compatible" that worked fine before.
I can no longer put Water produced by the Rapid Ice Melting (Oxygen) recipe in a Vacuum Boiler into an EM plant for the Water seperation recipe to get additional Oxygen. This does work when I use a Electrolysis Plant.
I can no longer put Carbon Dioxide produced by the Forced Combustion recipe in a Vacuum Boiler into a Sealed Greenhouse to produce trees.
I can no longer put Steam produced by the Advanced Water Boiling recipe in a Vacuum Boiler into a Steam Engine for power.