This was an interesting flight. Before we get into the details I think the cause was an in flight failure of the motor speed control that caused your crash. I.e. the problems you're experiencing now are not the result of the crash. From what I know about DJI they would not invalidate the warranty because you've modified the controller.
Apparently the P3 Standard does not have the same ESC as the Advanced or Professional. Commanded motor speed is available but information about actual motor speed or motor load isn't available.Without actual speed or load the analysis is a bit more indirect and circumstantial.
This graph shows relative Height and total acceleration.
View attachment 47833
The problem started at about time 181 resulting in a steep descent and crash at about time 187.493.
This plot shows the commanded motor speeds for all 4 motors
View attachment 47836
It shows that the left back commanded went to the max value when the problem started. At the same time the right front commanded went to a lower setting. This indicates that the left back lost propulsion and the right front commanded was reduced to compensate. This behavior is normal when propulsion is lost on one motor.
This plot shows that the P3 started to spin when the problem occurred.
View attachment 47837
This also is normal with loss of propulsion in one motor.
Finally, your video showing the motor start was really interesting. The purpose of the 2 motor bursts at motorStart is to test the response of the motors. (Some have speculated that it may be to tighten the props). On a P3 Advanced or Professional the response is evaluated by looking at the actual speed and load values. Any anomaly will cause a shutdown and an ESC error to be reported. From your video it is apparent that the P3 Standard is unaware of an anomaly (since it can't measure actual speed or load) and continues to run without reporting an ESC error.