Yep, I tried it, not a good experience…
Message appeared immediately after loading a pre-made mission.
Then after starting the mission, drone flew to 1st waypoint and dropped height. Then I noticed that a few, not all, waypoints height were all to cock…
point 1 was -161
point 10 was -3
point 11 was -36
all others were as created so I don’t think it was me selecting wrongly with AGL option.
I had set 2 POI’s, the first at 1 metre so camera should be looking at tree base, the second at 25 so as to look at tree top branches.
I corrected those incorrect waypoint heights on the screen, re-saved, and set off again. Flight was good in as much as it followed the course accurately.
However when it reached the first of the waypoints looking at POI-1 instead of aiming at tree base it tilted 90deg. down to look at ground below. It stayed like this for the rest of the flight (ignoring POI-2).
At the end I was able to raise gimbal using the ‘wheel’,
The gimbal angle indicator stayed on the screen at the position which would normally show 0deg. (horizontally ahead) but it showed the number 30. I can’t think why 
As waypoint flying for cinematic filming is my reason to use LITCHI I’ll be looking out for the ‘latest’ SDK from DJI
HTH
Steve 