This is the sum total of the changelog for the Android GO4 app update yesterday.  Wow!

If that's all they did then I would expect nothing else.

It's a pity that Google store doesn't show a version history. In the Apple store the history of all updates can be seen, and some are very elaborate , as example V4.2.16 lists one and a half pages of notes covering general fixes, Mavic Air, Inspire 2, Phantom Pro V2.

Whereas 4.2.14 says 'Bug fixes'

You can view release history on sites like APKMirror.

4.2.21
- Fixed map layout issue
4.2.20
- Improved the GEO Zone database upgrade process for Wi-Fi connected devices such as Spark and Mavic Air.
- App available now in Spanish
4.2.16
General
-Improved the GEO Zone database upgrade process
-Updated the FPV map. Users can now check GEO Zone within 50 km
-Updated warning system when obstacle sensing is unavailable
-Updated DJI Products Terms of Use and DJI Privacy Policy

Phantom 4 Pro V2.0
-Added support for the Phantom 4 Pro V2.0

Mavic Air
-Added max flight speed control in ActiveTrack. Users can now switch between Velocity Priority and Obstacle Avoidance Priority modes
4.2.14
General
Optimized low power take-off prompt in sub-zero temperatures.

Mavic Air
Added additional warning messages when propeller blades are getting iced up in low-temperature environments.

Inspire2
Added Point of Interest (POI) functions within intelligent flight modes. Set a POI on the map as the point of interest function sub pattern.
Fixed a bug where the DJI GO 4 app will reset the camera frame rate and resolution when connecting a device.