I've not come across an LPG tank with a valve that would close in the event of a minor accident. They do have safety valves designed to close if there is a sudden escape of gas - for instance the supply pipe getting broken in an accident. Some have manual valves on the tank to allow safe work on the system - could it be that a manual valve has been closed whilst at the paint shop? Or is it just the LPG pump or connection playing up on the day you tried to fill it? A local LPG installer would be the place to ask - all makes are broadly the same.
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