Y’all go ahead and laugh big, I’ve been at this for over an hour.
Of course there were some extenuating circumstances, like an EpiListPickerPanel in the mix, so I was trying to isolate that, as that was the bound field I was actually updating. (Replacing the bound field with a pre-defined list from a template.)
I wish it was that simple. I remembered how after I saw a snippet of a quote from @josecgomez in the search. I saw the text “BeginEdit”, and finally remembered.
I’ve been rubber ducking to myself for an hour, and it still didn’t come to me.