Description

When changing the background on a separator block, using the solid colors or the presets choices on the Gradient tool, everything works.
But as soon as a user tries to use the sliders in the Gradient tool to modify it, the separator block visually disappears from the Editor as well as the front end.

Step-by-step reproduction instructions

• Add a separator block to a post or page
• Change the background color using the gradient tool
• User the slider of the selected gradient to move gradient hues
• Save the post and view on front end.

Screenshots, screen recording, code snippet

In this video you can first see that the present gradient works.
The when I try to change the colors it disappears.

Environment info

WordPress 6.3-RC2 but I also was able to reproduce on WordPress 6.2.2
Twenty Twenty-Two theme.

Chrome 114.0.5735.248
Firefox Developer Edition: 116.0b7
MacOS 13.3.1

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes