I have a problem rendering a sphere with a semi-transparent material on a transparent background. When rendered in preview mode, the result is correct, the invisible parts of the sphere don't show up :
But when I calculate the final render, I only get a totally transparent image.
When the transparency box in the Render Properties is unchecked, it works fine : the problem only occurs when the background transparency is enabled.
For the material, I used a noise texture linked to an emission shader which I added to a transparent one :
Would you have any idea where it comes from ?