Agreed, I think limiting the maximum power is an easier approach. It’s also meant for a grid-connected setup.
Can you disable PowerAssist on the Multi RS? I don’t recall seeing a setting for it like on the MultiPlus-II.
I am having the same issue. Put in a case with Victron (via importer) will see what they reply. This is a problem when you have stack of batteries and one by one they get empty (or you have for whatever reason 1 full and a bunch of empty ones).