Note you may have a 2nd PNR with China Airlines. When changes like this are done, you can sometimes end up with a double PNR. One showing you in business with a 006 ticket and the original PNR with CI ticket. Hopefully it correctly updates. In case it doesn't this is first thing to have them look for.
BTW CI has been running Z fares from JFK/LAX/YVR/YYZ-SYD/AKL for around the same price. May not be available for your dates of travel. However it's something to look at.