RCOut drops after 4 to 5 sec after Mode Switch. If the set airspeed Min is low (10m/s), may be it reaches the speed level before the power drops.
But when the set min speed is e.g. 13 m/s the power drops before the target speed is reached.
The logs of the showed graphs.
Test 48: https://drive.google.com/open?id=1_lP6Es_Aduwnq3ZNmLuoLL4VKYz4shfQ
Test 52: https://drive.google.com/open?id=1lRaE6Q15hI-xh5SCXIbAqosAxNzf6Pf5
Test 53: https://drive.google.com/open?id=1QBKdakZpDLXG4jb6BJJ1DqKeFmNEvD8K
Or the video of Test 52 where the bad transition could be heared at 0 min, 47 sec.