Another possibility is that the plunger inside the solenoid valve at the tank has a failed rubber seat. Turn off the tap firmly, undo the 8mm hex bolt on the coil and remove the coil, undo the 17mm hex brass barrel nut that contains the plunger. The rubber seat may have a hole in it cut by the brass seat it rests on. There will be a tiny rubber slug sitting there blocking the flow if this is the case. Don't refit the plunger to the solenoid and don't damage the o-ring as you assemble the valve barrel. This is a temporary fix to get you going. The plunger is exactly the same as many other gas valves so easy enough to replace so it remains safe. Use some soapy water for leak checking and of course no naked flame anywhere nearby.
Or there is the possibility someone turned off the tap while you weren't looking...
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