We have found out an issue with M300RTK. When you set the finish action as return home, the aircraft will hover 0.7m above the home point. If you upload the mission and start it agin, the SDK will return without any errors but the mission will immediately finish. At this state, even you land the aircraft and upload-start again, the issue is still here unless reboot the aircraft. The correct way is to ensure the aircraft calls confirmLanding when the aircraft hovers above the ground and then upload-start the mission.