Erroneous "added a comment" message in feed

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Platform (Android, iOS, Website): website

App version number, if a mobile app issue (shown under Settings or About):

Browser, if a website issue (Firefox, Chrome, etc) : chrome

URLs (aka web addresses) of any relevant observations or pages:

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Description of problem (please provide a set of steps we can use to replicate the issue, and make as many as you need.):

Step 1:

Step 2:

Step 3:

See the following observation:
Today bob777 added a confirming ID, but this shows up in my feed: image

The comment was added months back. Shouldn’t the feed say “bob777 added an ID?”

I have seen this same thing many times with different observations recently.

This is a known bug that has to do with mentions, see