There was some recent update where comments from the notification bar open in the interface they were created in… when I get to that interface, there may not be a comment block for the table the comment is in, and the record may not even be in the table anymore due to filters. It is quite a big effort to read all the comments that have been directed to me, involving remembering the record name the notification cited, finding and opening that record if it is still on the interface, or tracking it down in the base if not.