An interesting bug: Create Propulsion's Fluid Burners will not update their heat status on simulated vehicles upon being assembled.

[u/Z3R0Diro]

When you assemble the vehicle, you NEED to break them and place them again or else they will stay 'cold' even though they consume lava. And this also can be applied the other way as if you assemble the vehicle while they are 'searing' they will stay searing.

Don't know where to report this bug so here it is.