The low battery RTH can be cancelled if the controller is in contact with the drone, that was part of my testing with the Mavic Mini, I did not want the drone landing (long wet grass). So I rebooted the controller once the RTH had started and took over control and overrode the RTH and hand caught etc..
Things become more complicated once the battery gets really low and the drone decides it wants to land. Then control becomes more difficult, it requires a LOT of throttle just to keep the drone in the air and laterally control seems 'woolly',
There was or is a recent thread where a drone was flown untl the battery did not have enough power left to keep the drone in the air and the drone when deep sea diving (Black Sea or that area). There are also videos on youtube of drones being at very low battery charge levels over water (bad planning and returning into head winds) and being forced to fly until they made the shore line ------or not.
Obviously it is better to save the drone but repeatedly flying to such extremes is, I believe, likely to damage the battery.
I recollect reading that loss of video signal can trigger RTH, if that is correct I am unaware of having experienced it and I do not know how to experiment with it.
With the Mavic Mini moving one of the sticks (I have forgotten which stick and need to check) can halt the climb to RTH height if the drone is over 60?ft up but still below the RTH height, it then starts to fly towards the home point. I have not yet looked to see if the
Mini 2 has the same behaviour