Toxins Computer has both inputs and outputs linked

[Vitatroll]

The switches are still linked. Press one and both chambers ignite. Same thing goes for the shutters/vents. It's been this way since cog2 release.

and yeah, all combustion chambers are weird. You can get toxins to work with a little effort, though. It's just inconvenient. Heat rises even quicker these days so it's not all that bad.