I tried implementing my own SceneMode picker and got Cesium to crash when I was testing it. To my surprise this crash is easily reproducible with any basic example in sandcastle.
Steps to reproduce :
Open sandcastle on any example
Switch from 3D to 2D
Switch to Columbus
Swtich to 2D
Repeat 3 and 4 until crash.
The result is either the crash in the attached screenshot (when the scene has objects), or when there are no objects the whole tab crashes.
Another thing I’ve noticed is that when switching the third time to columbus view, the scene seems to be much slower