Have you tried it after recharging the battery and was everything fine?
I just wonder if it didn't give you a false reading on battery power level and actually had less then 28%.
On a side note, when I was doing some contests, had to search for buried steel bars that had a tag on them. Most of the time this would be on a beach. What I learn from that is there are also magnetic rocks which would get pick up by the pin detector.
Now I wonder if these rocks could affect the drone as you seem to be on the ground when this happen.
The vertical speed appears to vary right at the end of the flight. If you graph altitude against vertical speed you can see the varience right at the end and it seems to land at 0.7m below the take off point.
How high up was it when the motors cut out and did you land in exactly the same place that you took off from?
The drone was at the level it won't go below detecting the ground.
Watching the video (uploading as I type) I am in shot at the end and am not sure if I touch the land touch screen button or at that moment it landed anyway?
Video recording stopped as usual which make me think I did ask it to land.
However, got the error message and Anafi was twitching and beeping.
I'm surprised that the motor cut out is not in the JSON file, Alert state. My expectation was, Alert_state=2 should be there but it isn't.
The only interesting thing is that the altitude measuring is going strange at the end.
Shortly after the moment when the Flying mode changes from 'Hovering' to 'Landing' the altitude jumps from a negative value to exact zero. before the tendence was going down from -0.5 to -0.6m.
This is sort of comparing Apples with Oranges but a few days back I was flying my Parrot Disco in a temperature of 1Degree Celsius, with windchill approximately minus 3Degree Celsius. I started with a fully charged battery but after five minutes it had dropped, according to the Parrot telemetry, to 67%. It sat at 67% for a further 10minutes and suddenly dropped to 55%. At this point I could no longer feel my fingers and thumbs and so landed. However when I checked the battery on a third party capacity checker it was showing only 12% left.
This is speculation only but is it possible that the 28% capacity shown in the OP’s screen grab is an erroneous reading and the Anafi actually went into low voltage shut down?
The drone never lost connection with the controller and was still showing live video and GPS lock (the screen shot was taken after I picked up and moved the drone onto the wall looking down the beach).