One of my posts was liked, but I didn’t get a notification. I suspected this was because a user I have muted was the one who liked the post, which I confirmed by viewing the post when logged out. Since they were muted, not getting a notification is, of course, expected.
What’s unexpected is that I could not see who liked my post when viewing the post itself. Instead of seeing their profile picture, I only saw an unclickable black circle, as shown here:
The settings page mentions nothing about suppressing this information. It only says:
Suppress all notifications and PMs from these users
I have this user muted (not ignored) only because they regularly link one of my topics and I was tired of getting those notifications. I have no reason to block anything else from this user.