Yes. This is a well known bug in Air/Google Maps. A lot of folks reported it on the Google Maps forums and here. It was reported over a year ago with no action yet. Major show stopper.
For this main reason, I switched to the http://developer.mapquest.com AS3 API. Plus they also recently released a Mobile Flash API that works great.
I suggest you check it out because I don't anticipate any action on this issue on either side any time soon.
Thanks for your reply.So I think I can put it as a known issue for my application. :-)