I don’t think it’s focus, but instead low resolution.
The DJI drones uses the compressed JPG to stitch the 360. Not the DNGs which a full of data and maximum resolution.
This is why I never use the one that the drone creates (on the SD card), but instead, I create it myself in post. There are a few tools to chose from, but I prefer APG. It does take more effort, but the difference is night and day
This may help.