No notification for comment, when some characters like '-' are appended to @username by a commentator.
134187
Name finding problem with comment notification feature
51569
Don't remove the @ part of my comment
117800
Comments not showing time of posting under some circumstances
113721
Why comment reply auto-completion feature (@) sometimes doesn't work?
24179
Comment posting issue
101911
I do not get notified when the system adds a canned "possible duplicated" comment
10373
Can we get rid of the threshold of 15 chars for comments?
3377
No notification (+15) for accepted answer
80261
notification for comments on Example Questions in Area51
70875
Comment flags are broken
38111
Zalgo in user names and effects on comments rendering
58272
I cannot respond to comments on my own question (no "add a comment" link anywhere)
138722
The system sees a comment that doesn't exist
33752
Why is there a comment in my inbox that doesn't exist?
1419
How do comment @replies work?
134340
Unable to @mention Partner user on chatter feed by Salesforce Internal User
53898
Do users get notifications when @ was edited in