Last time the cops “lost a camera” in an arrest like this one, another person stepped forward with another video taken of the same incident that showed the cops lied... court ended up tossing the charges, but of course nothing happened to the cops.
I bet you if the video showed what the cops said happened the camera would still be around...
Double videoing is always smart, the first camera in plain view and recording locally, the second camera hidden and transmitting to redundant, encrypted, hidden storage (even out of country if possible). If something hokey happens to camera 1, then camera 2 can be revealed.