Steps to reproduce

1. On a WP.com test site, start a new post in the block editor, and add a 'Related Posts' block.
2. Publish and view the post to verify that the block is present on the frontend.
3. At https://wordpress.com/settings/traffic/<yourSite>, disable the Related Posts toggle
4. Reload the published posts, and verify that the Related Posts block is no longer visible
5. Edit the post again in Calypso.

What I expected

The block to be disabled (showing an error that it's unavailable), and to be missing from the block picker

What happened instead

The block is still there (displaying example content), and is still shown in the block picker

Context

In Jetpack, this works as expected.

I'm guessing something is wrong with block registration.

/cc @tyxla

Primary issue

#32401