Reply box is collapsing / disappearing when replying with '@' character

My reply collpase after the Date@row - it just collapse and I am having hard time adding anything at the end.
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Answers
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Hi @heyjay
Thank you for reporting this and capturing a video of the behaviour! I will submit this to the web team for Community and we'll look into it.
For now, I would recommend not using the code formatting feature and typing your formulas in plain text without formatting to see if that helps.
Thanks,
Genevieve
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Hi
When this happens to me, I add a bunch of spaces, then move my cursor back a few characters and then enter the @row part. The spaces that are already there stop the behavior.
It isn't just @ that causes a problem.
> and < are also problematic (they convert the paragraph into a quote and remove themselves).