If a user posts a message in chat that links directly to another chat message like
12345689: You smell funny!
The chat rightly highlights message
12345689 when you hover over
User: You smell funny!
If the user or a moderator deletes the
You smell funny! message, the text changes to
(removed), which again is expected.
However, hovering over
(removed) still highlights the previously referred-to message, in this case
12345689. I have to assume this is unintentional behavior for a message that is ostensibly deleted.