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Hi my name is Robert...
What is the model of the fridge?
So it runs fine on LP when the room is extended? Want to be sure you are trying it on LP and not AC power....
Yes they should run when the slides are in and you are unplugged. Two things can cause this, low voltage and if the LP was getting pinched off some how. If it is sparking it should want to light off. I would be checking the voltage of the batteries when you are unplugged the fridge needs at least 11 volts to work properly. When you are plugged in the power converter is making the voltage and should charge the battery. When you unplug you are running off of battery power only.
The other issue is the Lp if a line was getting pinched off it would be a major concern. A shop can test the LP pressure with the room extended and retracted to see if that is the cause.... I would check the voltage and if it is good have it looked at and show them what it is doing, it is not right.... Robert