It sounds like a wire somewhere downstream of the switch has come disconnected.
To the best of my knowledge, the power wire is daisy-chained from one light to the next to the next. And of course, somewhere it is daisy-chained down to the LP gas detector. But I have no idea what the order of the daisy-chain is.
My best suggestion is to unscrew one light fixture at a time from the ceiling, pull the wires down out of the cavity, and determine which fixture has power at the daisy wire but not at the fixture.
The grounds are not daisy-chained.
Bill
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