In DJI Fly  1.4.12 iPadOS 15.0.2, DJI broke the compass.
Usually you can select to lock the map pointing north, or have it point in the direction you are facing.
Regardless of seeing the locked "N" indicator...or the compas needle, The map is locked to north.

This feature to unlock the map is needed so a pilot knows where to point the antenna.

Hi! You might be better off posting your question in the 'products' section of this forum.  That is way more active.    -   https://forum.dji.com/forum-129-1.html