Melbourne - Hong Kong (transit) - Shanghai - Hong Kong - Melbourne eligible for 144 hour policy

I will be travelling from Melbourne Australia to Shanghai transiting in Hong Kong for a few hours. Staying in Shanghai from Friday till Tuesday and then catching a flight back to Hong Kong for 5 days and then returning to Melbourne Australia. Would I qualify for the 144 hour free transit because I arrive into Shanghai from Hong Kong and then leave Shanghai back to Hong Kong? I've already had a terrible incident once before and not been allowed to board a flight to China due to visa issues I really do not want it to happen again.Please help!