There is a flag. It’s a custom one with a message from a user:
(Some other user didn’t format his code as code, so the post is pretty unreadable and 17 screens long.)
I agree, so I open the post and edit it.
Now I have to close the flag. I do so by clicking “Agree” which brings up this modal:
As I don’t want to hide the post, I click “Agree with flag”.
I get this:
Here is a screenshot of Chrome devtools network panel:
First the flag is hidden, but if I reload the list it appears again.
Here is the response of the failing request in detail: