The Endpoint Agent still doesn't support Native Bluetooth monitoring and prevention in my opinion. Bluetooth over USB is supported is because Bluetooth devices expose themselves as USB devices and the OS does not distinguish between them. So its behaviours is similar to that of a standard USB device.
To further elaborate: the current DLP product does not analyze content in transmissions via Infra Red or Bluetooth. Most customers do not see this type of connectivity requirement for typical business interactions (unlike USB). So its recommended to disable these devices on the endpoints as there is not a typical use case that is required for business interactions.
However there are other measures you could take, for example use DLP Endpoint's Application File Access Monitoring & identify the process/service used by Bluetooth (for example: fsquirt.ext) which could then be blocked.