StageStyle.EXTENDED with transparent background

[Glavo]

Hi,

Our application has traditionally used StageStyle.TRANSPARENT to enable a
fully customizable stage.
This allows users to set custom backgrounds and adjust the window's opacity
freely, leveraging our powerful personalization features.

After the release of JavaFX 25, we want to migrate to StageStyle.EXTENDED
so that
we can use native window decorations and no longer need to draw window
shadows ourselves.
But using StageStyle.EXTENDED creates a stage with a white background,
which prevents us
from setting the window's opacity.
So is there any way we can make the stage background transparent while
using StageStyle.EXTENDED?

Glavo
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