Billboards are replaced with black squares, particularly often on mobile (android/iOS)

When adding image billboards, they render correctly on my desktop but when opening the same page on my Android S6 cellphone as well as my iPhone 5SE image billboards do not render correctly and look like this:

I've searched for a solution but could not find any.

Is there a way to check on a HW basis if image billboards are supported?

Reproduce the image billboard rendering on the Android S6 and iPhone 5SE described in the issue, then trace the billboard rendering path in the Cesium source. Determine whether the affected hardware supports the required rendering feature and define the expected fallback or error behavior. Done means the issue is resolved for the reported mobile cases or support is clearly reported.

Written by the indexing model from the issue text.