Regardless of whether they are purged or not, it would always be possible to get some liquid propane into a tank on first fill. Any air in the tank would come out first, followed by propane gas once all the air had gone. It would make lighting the flames a bit difficult until all the air had gone, but then on second and subsequent fills, all the air should have been bled off so the problem would only arise after the first fill.
One of the ways of purging the tank is to put a small amount of liquid propane into the tank and then open the valve to release the pressure. Air comes out first leaving just propane inside.
Tony Lee - International Grey Nomad. Picasa Album
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RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper