I've got front and rear cameras on my bicycle and both of them have a simple crash protection feature. If the cameras detect the bike falling over, they'll mark

I've got front and rear cameras on my bicycle and both of them have a simple crash protection feature. If the cameras detect the bike falling over, they'll mark the current video segment (typically split into 5/15 minute segments on the SD card) as protected and won't be overwritten when the SD card fills up which is the usual operating mode. If Tesla are marking crash data to be deleted, then that's not designed to help the customer, but to protect Tesla.