Classes are stripped out

Would be nice to have an example image triggering the error uploaded to the issue though

Please view the screenshots of the cover block element before and after saving the node. Notice how the `is-dark-theme` class is missing from the saved output.

Great!

I was actually more thinking of an actual image to upload that would trigger the error 🤓

You don't need an image. Just select black or any dark color as background.

Aha!

I was reading this: "upload a dark background" and assumed that meant uploading an image that was dark to use as background 🤓

Thanks for the clarification!

Sorry for the confusion. This issue was created in 2021 so I don't have the actual image used back then, but I'd say any dark background image should trigger the same issue. I tested it now using the color selections and it still triggered the issue.