Flying Bishkek-Urumqi-Guangzhou-Manila, free transit?

It's with China Southern all on one ticket. Presumably I'm eligible for the 72 hour stopover in Guangzhou despite already transiting at Urumqi (4 hour stopover). However, we won't have Chinese visas. is the first stopover in Urumqi problematic due to us having to go from to domestic departures for the Urumqi-Guangzhou flight? Thank you.