Unfortunately, the fix took quite some time and the original topic (see Experience with DJI Osmo Mobile SE) has been closed in the meantime. Maybe some moderator can add this post to the thread as solution for others that might run into the same problem.
I wanted to share the info that with the DJI Mimo app version 2.8.1 the gimbal Osmo SE finally also works with panoramic picture taking with the rear camera!