The new DJI Mavic 3 is not compatible with the original DJI Smart Controller V1. We already feared this would be the case but Henrik Olsen from Tech Drone Media verified it in his latest YouTube video.
Update: official response from DJI
With DJI’s latest firmware update (v.01.03.0000) for the DJI Mini 2, the sub-250-gram drone is now compatible with the DJI Smart Controller. The update also addresses a bug in the automatic battery discharge.
In today’s video about the DJI Mini 2, it was shown that the new lightweight drone will use the exact same remote controller as the DJI Mavic Air 2. This should mean that the DJI Mini 2 also works with the DJI Smart Controller. Or at least, DJI can make it work through a firmware update if they so chose to.
Update: How does the Mini compare to other DJI drones on specs?
Finally, DJI released update V01.00.0820 that allows you to use the DJI Smart Controller to fly and control your DJI Mavic Air 2 drone.