Yeah. Until it’s a fireable offense, or maybe even a criminal offense, to have your bodycam off during an encounter, this is going to keep happening. The problem is that the cameras are not running all the time, and cops can then claim that they forgot to turn them on in the heat of the moment.
They need a system like car dashcams, where they are recording all the time, and where you can then press a button after an incident to ensure that the material recorded during that incident is retained on the memory card. Then, when an officer calls in an incident, the dispatcher or superior officer or whoever can say, “Please make sure to save this incident in your camera so that we can review it later.” Then, if you fail to do that, you are summarily fired.
Good luck getting police unions to agree to that, though.