Video with audio is attached. (Note that in the video I accidentally inserted the content toggle inside a quote block, but the behavior described below happens even when I insert a new content toggle outside of other blocks.)

Steps to reproduce:

1. Create a new page or post.
2. Publish the new page or post. (I was not able to repro just using unpublished drafts.)
3. Add a content toggle to the new page or post.
4. Add some text to the content toggle and make some of it bold. 
5. Update the page/post, return to the page/post list view in the WP admin area.
6. Go back into edit mode for the page/post.
7. The bolded text will now render surrounded with “u003cstrongu003e” and “u003c/strongu003e” on both the edit view and the published page.

I noticed this behavior was most common when I made the panel title text bold, but it also occasionally happened with the panel content text. Ampersands also sometimes rendered incorrectly.