Related Posts Block: No styles on archive pages

[scottsweb]

Whilst working through #14020 I noticed that the styles for the related post block are not loaded on the archive page, so in twentytwenty it currently looks like this on the homepage:

Steps to reproduce the issue

1. Go to wp-admin and create a new post
2. Add the Jetpack related posts block to the post and set it up how you like
3. Use any theme that shows the entire the_content on the archive page
4. See if the correct styles are shown on the single post
5. Compare those styles to the archive view

What I expected

I expect the block to look the same regardless of where it appears on my site. I have a feeling this may impact other blocks too. It is possibly being caused by the conditional style loading in jetpack-related-posts.php line 1658:

		$enqueue_script = ! ( class_exists( 'Jetpack_AMP_Support' ) && Jetpack_AMP_Support::is_amp_request() );

What happened instead

The block looks incorrect.

[jeherve]

Noting that this is specific to related posts added via a block. We don't display "regular" (i.e. bottom-of-post) related posts on archive pages.

[stale]

This issue has been marked as stale. This happened because:

• It has been inactive in the past 6 months.
• It hasn’t been labeled `[Pri] Blocker`, `[Pri] High`.

No further action is needed. But it's worth checking if this ticket has clear reproduction steps and it is still reproducible. Feel free to close this issue if you think it's not valid anymore — if you do, please add a brief explanation.