Something isn’t adding up here. As far as I can see the parachute trigger worked as it should. But that’s still just a result of the original problem: Why did the motors go to Min when the drone was in RTL? The drone wasn’t even trying to stabilize it self, yet alone stop the descent.
Even with CTUN.ThO at 0 like it is in Stabilized mode, the motors should at least be keeping the spinning side up. All this to say, I don’t think the problem is with the parachute logic, it’s something before that.