I recently upgraded to version 20.1.  In AP, I voiced a check that was printed previously in version 18.4, and restored the invoice as open (but did not select for payment during the void).  For the same vendor, I created another, new, invoice.  I went into Print Checks, selected both invoices for the vendor, including the invoice related to the voided check.  Instead of getting just one check for both invoices, it printed two separate checks.  This has never happened before.