Broad selector for figure elements in WP 6.1

[gbaggaley]

Description

Also posted to trac for reference:
https://core.trac.wordpress.org/ticket/57103

I've just updated a bunch of our websites to 6.1 and seen that there's an incredibly broad css selector for all figure elements introduced into ./wp-includes/css/dist/block-library/style.min.css:

figure {
    margin: 0 0 1em
}

This has broken the styling on multiple themes we've developed for clients.
The same issue also happened a few months ago for img elements (https://core.trac.wordpress.org/ticket/55229 and #39021).

Is there anything that can be done to prevent this happening again?

Step-by-step reproduction instructions

1. Update WordPress to 6.1
2. Activate any theme that uses a figure element
3. figure element already has a margin applied to it from ./wp-includes/css/dist/block-library/style.min.css

Screenshots, screen recording, code snippet

N/A

Environment info

• WordPress 6.1

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

[addedlovely]

+1 This is a very loose selector, also causing us multiple bug reports across multiple client sites.