please see the testcase in #3here.
The SelectItem and ListGrid both use DataSourcefilteredAggregation_orderItem.
The SelectItem uses operationId=“summary” and the ListGridoperationId=“fetch”. This can be seen in the requests in Developer Console’s RPC Tab.
Now if you click delete on a row in the ListGrid, this row also disappears in the SelectItem. This is a bit unexpected as you stated here:
The operationId of the remove-response is not set, so I’d expect it to affect the ListGrid (because this fired the request and has a default operationId of “fetch”), but not the SelectItem.