I still held the button to let the motor fly up, but when I changed the tilt angle for it, the motor lost control and fell down.
If these effects are happening after you changed from the stable previous version, I would advise going back to the stable previous version.
In other words, quit while you're ahead.
During the control process, I see that when dragging 2 sliders at the same time, it leads to model chaos. Is this a problem in my app?