I have corrected the title of the video.Interesting mistake (bug!) in the middle of the video. There seems to be a second, invisible plain about 3m above the ground. The game in general still suffers from such height distortions, don't know what to call it, I'm not a developer. Unfortunately you chose the title a bit unfortunate: "mistakes" suggests player errors. "Bugs" would be the better term in this case. I suspect you are using a translator (like me) where "bug" often translates to "mistake".
Thank you.