Yes, and that a special handling/hack built into WinBox 3 that parses/splits the dst-address and src-address field values. Up to 7.19.1 you don’t have access to the ports with neither /ip firewall connection find nor /ip firewall connection print proplist=. The hack is actually against the philosophy of having WinBox simply mapping what available to the command line / fetching the available property definitions from RouterOS.
That’s why the change in 7.20 is better than building the special handling into WinBox 4, because sorting & filtering would work automatically, independent of the WinBox version, and also in scripts and on command line.
