Cannot upload structure scan mission to Pixhawk

I am using QGC 3.3 and flashed the Pixhawk with the latest firmware. When I create a mission using Pattern -> Structure Scan -> Circle, it will not upload. I get these error messages:
Mission transfer failed. Error: Vehicle returned error. Command not supported.(MAV_MISSION_UNSUPPORTED). Command (ROI to next waypoint, MAV_CMD_DO_SET_WPNEXT_OFFSET, 196)

This does not happen with waypoint missions. They upload fine.

What is the problem?

I believe I have the answer:

I’ve been able to repeat this multiple times. Based on the error message, this function is not yet supported, yet it says QGS 3.3 has this capability. Do the developers have any idea when Structure Scan will be available??