Image block placeholder not showing border or radius

[annezazu]

Description

The placeholder for the image block no longer reflects border or radius changes.

Step-by-step reproduction instructions

1. Add an image block.
2. Open block settings and change border and/or radius.

Screenshots, screen recording, code snippet

placeholder.border.and.radius.mov

Environment info

WP 6.2 RC2 with and without GB 15.3.1

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

[Mamaduka]

This bug was introduced in 6.1, not in 6.2. Technically, this should not be fixed during 6.2's RC cycle.