Icon flip in custom polyline material

CesiumJS
1

Recently, I have a thorny problem. I create a custom polyline material using icon. Unfortunately, when I am zooming, pitching and rotating the map in 3D mode. The icon flips when the camera is very close to the earth surface.

image

zoom and the polyline icon filp

image

Someone can tell me how to fix it !!!

Sandcastle example:

Browser:

chrome 90

Operating System:

macOS 10.15.5

2

Thanks for catching this - I’ve tagged your issue on GitHub so we can take a look at this when we get the chance.