Can Capture Recognition Processor process batches with multiple documents in it?

Client want to run scan batches choosing simplex at capture stage so that they don't need to put barcode separators in the pile of paper.

They also want to have batches with multiple page invoices that are separated with barcode separators.

The multi page batches work successfully. But the single page batches do not get released after refreshing the batch list. I'm wondering whether the Recognition processor can handle it or whether I'm missing some config.