SiK Radio RSSI gone in Mission Planner

About a year ago, I remember having my telemetry radio RSSI available in mission planner. Now all of the RSSI options that I choose have a value of 0 at all times. Does anyone know what could be the problem?

The Cube autopilot
Plane 3.8.4
Mission Planner
RFD900X & also happens on the smaller 3DR radios
Default settings on telemetry, etc.