I feel like that happens once in a while when the fill value not taking gas. I usually unscrew it, drop a bit gdd oil, gas filling test it(without the mag), screw it back to mag, and mostly would by fine. Seems like having sticky o-ring that blocking it not taking gas. That's why you may see me when filling gas mag, I'm holding high the propane tank up side down besides my ear and i listen the sound of gas transfer, if I don't feel it, the filling value needs to be service.
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aka Uncle
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