Skybox doesn't render on camera sensor

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I'm trying to use the Fortress demo scene: https://app.gazebosim.org/OpenRobotic... The <sky> tag work OK in the Gazebo GUI, but renders gray in the camera sensors. It even ignores the <background_color> and renders gray:

Same scene in the GUI:

There are still some rendering issues with the sky (probably because of the integrated Intel GPU) but it renders something.

Should the <sky> tag even work with sensor cameras? If so, what changes should i try to get them working? Is it possible to default to the <background_color> when the sky doesn't work?

I'm using Ignition Fortress with ROS2 Humble on Ubuntu 22.04.

Thanks in advance!