Site Editor Compatibility: Repeat Visitor Block styling issue with radio button in editor UI

[andrewserong]

In the new site editor in Gutenberg (/wp-admin/admin.php?page=gutenberg-edit-site), there is a styling issue with the radio buttons within the Repeat Visitor Block's placeholder state.

Note: this is a similar issue to the radio button styling problem in the Latest Instagram Posts block: #19466

Steps to reproduce the issue

1. With the Gutenberg plugin active (>=10.4.0-rc1), activate a block-ready theme (like tt1-blocks)
2. In the site editor, insert a Repeat Visitor block into the Footer template part
3. Observe that the radio button styling looks off compared to a normal site running Twenty Twenty theme

What I expected

For the radio buttons to be rendered correctly. For example:

What happened instead

The radio buttons render with the white circle in the wrong place:

[andrewserong]

Tested and confirmed that this issue is resolved by the Gutenberg PR WordPress/gutenberg#30670 that adds in the correct box-sizing: inherit to get this working.

The fix will land in Gutenberg 10.5.

[andrewserong]

Closing out this issue as it doesn't require any changes in the Jetpack repo (just beware that the issue will still display until GB 10.5 is released).