Why are read emails appearing in is:unread in Gmail?

Published: 24/09/2018
Why are read emails appearing in is:unread in Gmail?
Source: WEBAPPS.STACKEXCHANGE.COM

When searching for is:unread in Gmail, there are about 100 email threads in my account that are not bold. (Others are bold, as you would expect.) These emails date back only as far as October 2017, not longer. Here's one example. I am sure I have read it before, and unlike other emails in that search result, it is not bold: Same thing in Inbox by Gmail: I can also find these emails using the subj

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