Describe the bug
WordPress/gutenberg#19097 introduced a regression where pasting rich-text in a paragraph causes a crash with: Cannot read property 'textAlign' of undefined at https://github.com/WordPress/gutenberg/blob/662c38e45c99f4d9232791d409bbce64fce4a0de/packages/block-library/src/paragraph/transforms.js#L26

Assumes WordPress/gutenberg#19190 being already merged first.

To Reproduce
Steps to reproduce the behavior:

1. Start with initial-html.js having only this:

<!-- wp:paragraph -->
<p><strong>Hello</strong> paste</p>
<!-- /wp:paragraph -->

2. Run the demo app
3. Go into the paragraph, select all text and "Copy" it
4. Add a new paragraph block from the Inserter and focus it
5. Long-tap and paste
6. 💥