Steps to reproduce:

1. Insert a paragraph into a post containing some unique text
2. Save the paragraph as a reusable block
3. Publish the post
4. On the front end, search the site for the text
5. Observe there are no results

Reusable blocks can contain content that should be discoverable via search.

This is probably a wider problem that affects shortcodes and server-side rendered blocks too, but let's focus on one thing at a time.