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Dear Laurie Armstrong,
Thanks for writing back and sharing the requested information with us.
As per the further updates, it seems the problem started to happen after formatting the columns in the Microsoft List, so I tested by formatting one of the columns in the List and after I save the JSON code, the comment icon is not displayed, then I removed the formatting, the comment icon is back.
However, the problem only happens when you apply the formatting for the title column. So, can I know whether you applied the formatting for the title column in the list?
We look forward to your response. Thanks for your cooperation.
Sincerely,
Mia | Microsoft Community Moderator