Description

When the caption for images in the Gallery is updated using the Edit Gallery interface, the change is not reflected.
Other ways of updating the caption work, such as using RichText or replacing the image from the image block controls.

Step-by-step reproduction instructions

1. Create a post and add Gallery block with some images
2. Click Add > Open Media Library from the Gallery Block controls
3. Navigate to Edit gallery and update caption for a image
4. Update Gallery
5. Notice that the caption is not updated.

Screenshots, screen recording, code snippet

Environment info

No response

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

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure