Hi all again. This is such a weird bug. Like I said a few months ago, I had my launch 11 replaced in January for the clicking, which got progressively worse. My replacement 11 was not making the noise for a few weeks or so. I started to hear it very faintly (like sitting alone in a quiet room) a couple of weeks ago. Since it was so faint, I figured that maybe I was actually just hearing the taptic engine itself and was being hyper-sensitive.
Well, this past Tuesday I dropped my phone on a wood floor from about 3ft (slid off a coffee table). Since then, I had started to hear the clicking a bit more loudly, mostly repeatable by holding down the volume slider or swiping up on the menu bar. This had me thinking that maybe it was in fact a hardware issue, maybe a super fragile taptic engine?
Anyway, I upgraded to 13.4 beta...and the clicking is gone. Can't reproduce it at all for a day. I have no idea what the bug was or what was causing it, but I am fairly certain the 13.4 beta fixed it.