Just happened while writing this post:
Quotes, started writing, opened a new tab to get the link, so I had to Google around a bit. Copied the link URL, and when I came back, couldnt type any letters.
I could paste, and it let me type punctuation, but letters didn’t show up, and they also didn’t display when I hit post. Also, the one boxing seemed to do weird stuff with that link, maybe you can see the edit history as an Admin.