Steps to Reproduce

1. Make sure you have the latest Gutenberg on.
2. Go to Sensei LMS -> Settings -> Emails
3. Click on any email to open it in editor

What I Expected

To see the email in the editor.

What Happened Instead

It was broken

PHP / WordPress / Sensei LMS version

8.1, 6.3, 4.19

Browser / OS version

Chrome, Opera

Screenshot / Video

With GB

Without GB

I'm not too sure, but after looking around a bit, it looks like there may be something wrong with the wp:pattern markup