Twitter URL Embed automatically in Preformatted Blocks

Describe the bug When two or more Twitter links are included, they will be embedded automatically.

To reproduce Steps to reproduce the behavior:

1. Go to 'new post'
2. Click on 'Preformatted'
3. post 2 twitter URL
4. See error there URL Embed

Expected behavior Preformatted Blocks have automatically embed when there are two or more Twitter links. This is not expressed when there is one link. The last link URL in the block is displayed in text. This phenomenon occurs not only with Twitter URLs but also with embed URLs.

Screenshots

Desktop (please complete the following information):

• OS: Mac OS 10.12.6
• Browser chrome
• Version 74.0.3729.157

Additional context

• WordPress 5.21 / Twenty Nineteen