Reported by @paper sinew
Bug Report: Sora 1 images rendering with transparent backgrounds instead of solid black
`Steps to Reproduce`
From time to time, Sora 1 images will render with transparent backgrounds instead of the backgrounds I want. Often this is when the background is black.
`Expected Result`
I don't get a transparent background unless I ask for one.
`Actual Result`
I get transparent backgrounds when I don't ask for one sometimes.
`Environment`
MacOS, Browser