I wonder if the usability bug is related to issue25684, even though it's a different widget.  The reason I'm suggesting that is that I had converted the DynOptionMenu to be a ttk.OptionMenu in configdialog, but when I did that, that selection of a target tag on the highlight screen and the clicking of a target within highlight_sample didn't stay in sync, and that sounds very much like what it happening in helplist.

My patch for 25684 fixed the reported issue, but also fixed what I was seeing in configdialog.