Backgrounds for ViewportFrames within BillboardGuis do not render as expected. In the image below, the BackgroundTransparency is set to 0 but the background is not rendering even though the border does.
The ViewportFrame is within the BillboardGui as stated in the title and multiple times in the report. ViewportFrames in BillboardGuis are officially supported and have been completely working.
It wasn’t until recently that the backgrounds for ViewportFrames in BillboardGuis are now invisible. However, the rest of the ViewportFrame functions perfectly fine still.