I posted the actual screen shot of the actual manual published by DJI. It states that if there is strong GPS when the drone is powered on, there will be no limits. You can choose to not believe that if you want.Regarding my thinking what's the different between no / lost GPS... I didn't think the Mavic would descend or change course if GPS was lost mid-flight. I was just thinking if I took it outside, locked GPS and then carried it inside and tried to take off that it likely wouldn't work just the same. (As I would not have a GPS lock at the time I took off.)
I suppose if I took off outside and flew through the doors I might have been able to achieve higher altitude once inside, but again, this wasn't even something that crossed my mind at the time.
J
Either way, as I noted, with the new firmware, the limits are changes, so it shouldn't be an issue for you anyway going froward.
Happy flying!