I've had the similar issue with a night flight:
Air 3S RTH is set at 50m. Yet, aircraft would climbs to 500m if I did not stop it.
All firmware undated.
Here's what DJI responded:
Due to the ambient light being too strong or too weak, the...
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@oc1doc it looks like your drone was trying to avoid an obstacle, as described in the Air 3S manual below. But if you share the TXT flight log, all of the needed data should be there to confirm what it was doing.