'has_transparent_background()' gives 'True' while background is black

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:bust_in_silhouette: Asked By florxb

Hey guys! I wanted to make a transparent background so I rebuild the following tutorial to 2:18:
I also followed this:
https://forum.godotengine.org/44699/transparent-background-so-that-desktop-is-visible
sadly I get a black background, after all the steps.
But print(get_tree().get_root().has_transparent_background()) gives me True