So, if we assume the OP is truthful, and certain he did not manually update the Home Point (because he didn't know it was possible, and he couldn’t have completely randomly stumbled across it and triggered it because of how deeply it is buried in the menus, without now also recognizing the screenshot instructions for how to do so), but the data shows that the Home Point was updated manually, how do we reconcile these two conflicting "statements?"
Must the OP be mistaken, and his assertions be completely and irrefutably dismissed, or is there a remote possibility of a unique bug that he inadvertently tripped over, that somehow updated the Home Point in some other way, which was recorded as a manual Home Point update?
Regardless, it was still pilot error to not know how to cancel RTH to the latest Home Point before signal was lost, and fly it back manually.
In all my years of flying DJI drones (since 2015), I have never used RTH. It is a feature, but not a guarantee, especially if you don't fully understand exactly how it works, and how to cancel it, while the drone is still under signal control, and how to reset it, when you discover that it is set somewhere other than where you want it set.