Did you empty the thruster? The thruster input will accept and pass through any fluid. It sounds like both of the thrusters tanks are full of the first fluid.


I should have clarified that in the post.
When the chemical plant fills up, the thruster will power on briefly from the fluid being ...

This is arguably not even a bug, but thought it was worth flagging. I was experimenting with making the lightest ship possible and the current variation I've made has the chemical plant directly inserting fuel and oxidiser into the thruster and the idea is to switch between recipes.

It will input ...