"Go Fly"? What's that? The Mavic Air uses the DJI Go4 app. If you are using something called "Go Fly", it is a bogus app. Use the correct app, and it will work.
This appears to be a known issue. However, it may not be known by DJI, who have not provided a fix. See this thread:
https://mavicpilots.com/threads/altitude-not-repeating-on-saved-hyperlapse-waypoint-mission-air-3.144248/
I have worked with...
Welcome from the Hampton Roads area of Virginia, USA. We have a Member's Map in the Upper Right of the Title Bar. Click on "Members" and then Click on "Member's Map…" Check it out and you might find some new flying friends...