I'm currently posting this with TornTools enabled.
No screens, and no idea how replicable it is, or if its expected behaviour. I'm pretty sure TornTools is irrelevant to this.
Needed to burn between 25 and 40 or 45%. Placed one oxygen, lit, at 22% it was slowing down so stoked with diesel. Instead of going up as expected, total burn went down to 20% before starting to climb again.
I'm unsure how major a problem it is, the diesel could have "added on" the lost burn % on top of its normal increase, but felt like its definitely worth noting.
Edit - fac mate has apparently seen it decrease when damping with blanket, I don't see why the burn% would ever decrease, feel free to confirm its intended though.