Billboard ghosting issue

1. A concise explanation of the problem you’re experiencing.

In 2D mode, we frequently but not consistently experience a ghosting issue with our billboards. Please see this video

2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.

I am working on getting a sandcastle demo together, in the meantime I am hoping someone may recognise the issue from the above video.

4. The Cesium version you’re using, your operating system and browser.

1.65 - issue has been replicated in Chrome & Firefox on Windows 10, as well as Safari on OSX.