Video showcasing this problem:
https://gfycat.com/gifs/detail/FrightenedSkinnyErmine
Devices specs:
iPhone 5 iOS 10.3.3
iPhone 8 Plus iOS 11.0.2
Browsers:
Tested with Chrome and Safari
Isolated project:
https://playcanvas.com/project/513416/overview/ui-test
https://playcanv.as/p/4vbXcY3b/
https://playcanv.as/b/G5ZbIOGC/
Seems like it’s not UI-related - happens even when no UI elements are presented in the scene!