Multiple themes: Quote blocks indistinguishable from paragraph blocks

[msilbers]

This is specific to the editor view and not published or preview views.

Steps to replicate

1. Open a site with Nucleare theme
2. Add a post or page with paragraphs and quotes
3. Stay in the editor

Result

You can't distinguish paragraph and quotes from each other.

Expected

I expect to see some quote formatting in the editor, as you can with other themes. Here's an example with the Alves theme:

• User report: 3837303-zen

[github-actions[bot]]

Support References

This comment is automatically generated. Please do not edit it.

• [ ] 3837303-zen
• [ ] 5664186-zen
• [ ] 8127709-zen

[kavyagokul]

From a duplicate bug—

• 5664186-zd-woothemes

[Robertght]

Another case in 8127709-zen. Theme: Rowling.