qGroundcontrol sending NAN waypoints

I am attempting to use the latest qGroundcontrol (downloaded yesterday) with Ardupilot. When I attempt to download any mission (trying right now with a single takeoff point) I get the error:

“Mission transfer failed. Retry transfer. Error: Vehicle returned error” Param3 has an invalid value (MAV_MISSION_INVALID_PARAM3). Param3: nan.)"

With the wonders of wireshark, I can see that it is indeed sending a mission item (one not in my list) with some nan params.

Seems like a bug. What’s going on here?

Save the Plan that is failing to upload to a file. Create a GitHub issue with that file and details on exact QGC version and ArduPilot firmware type an version.