Sorry to flip-flop on this report. I let my Multiplus cycle through two AC Input Control cycles, and the problem persists.
The problem is that the AC Input Control is not respecting the voltage trigger that I set, as you can see in this short video. https://streamable.com/u8muvp
Update: It occurs to me that perhaps the problem here is that the Mulitplus had been triggered to turn AC Input On until Bulk Charge was reached. But after that process started, my AC Timer turned off the power to the Multiplus. If so, then it is probably simply tryng to finish the last cycle that it had started.