Latest Post Content - show Full Post -bug showing mix of Classic and GB-

[paaljoachim]

Describe the bug
I am testing the Latest Post block. Turned on Post Content. Selected to show the Full Post.
One of the posts content preview shows code that stretches across the page as well as image html.

The post that is causing the problem:

I do believe this is a more fundamental problem with Classic <-> Gutenberg then just the latest post block.

To reproduce
Steps to reproduce the behavior:

1. Create some posts with a mix of Classic and Gutenberg.
2. Add the Latest Post Block.
3. Show full content.
4. An error might be seen.

Expected behavior
A clear and concise description of what you expected to happen.

Desktop (please complete the following information):
Local host - Desktop Server.
Chrome

@jorgefilipecosta

[arunsathiya]

I ran into a similar issue with the first word being very long, which I have flagged here - #15721

[paaljoachim]

It looks like this has been taken care of.

1. Added the Lastet Post block.
2. Turned on full content.
3. It looks fine now.

Tested with Gutenberg plugin 9.8.
Themes: Twenty Twenty One and Twenty Twenty.

(A new bug showed up. Clicking the block does not activate the sidebar settings. A new issue will be created for it.)

Backend:

Frontend: