Description

When margin is applied via theme.json to a site title block, it looks like it's being overridden by the following CSS on the front end:

body .is-layout-flex > * {
    margin: 0;
}

Editor	Front end

Step-by-step reproduction instructions

1. Insert site title block
2. Set some custom margin sizes in theme.json for core/site-title
3. You should see the margins correctly applied in the editor, but they are not applied correctly on the front end

Example theme.json:

"core/site-title": {
				"spacing": {
					"margin": {
						"bottom": "32px",
						"top": "32px",
						"left": "0",
						"right": "0"
					}
				},

Screenshots, screen recording, code snippet

No response

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