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The tank it self might have been misfilled or had a slow leak that was not caught on inspection. Consider the low cost of a replacement I would probably look into that when the stores open. Given your description it certianly sounds empty.
Also yes, "gas" will be released even after the majority of the contents are empty as there will be a point where the remaining propane volume in relation to the volume of the tank will be at very low pressure relative to the outside air. Also if water is accidentally introduced into the tank it can effect the propane's ability to vaporize inside the tank.
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