Editing Comment is broken

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Some slip of the mouse left this comment in an odd state where I cannot edit the content.
Here is what it looks like when I am not editing:
Here is what it looks like when I am editing:
I can't see the text that is there and I can't enter any new text. I have time to edit, but no ability.
The text box to edit the content is missing. What went wrong?
Answers
Even I cannot able to see your text. Shall I delete and post a new discussion ?
@peteroznewman I can't edit in that thread but can here. I did wonder if opening the thread with the username was the issue but it's not. We'll keep an eye out to see if it's more widespread.