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Hello,I am developing an augmented reality game with the help of ARKit.I code in Swift 5 on Xcode 10.2.1.I am developing on a MacBook Air equipped with MacOS Mojave 10.14.5.The application is launched from an IPad Air 3 equipped with IOS 12.3.1.The problem appears after the map is placed. The stacked blocks move by themselves and fall off the playing field.Here is a folder containing a video and images showing the problem.https://transferxl.com/08jHjxfWpQzgGBThank you and have a good day.