I'm using ioFTPD.v5.8.5r and neither ioBanana 19r or Version Script v1.2 displays correct (or any for that matter) version of ioFTPD.
[R] (09:25:25) site version
[R] (09:25:25) 200-ioFTPD version
[R] (09:25:25) 200-ioBanana version v19
[R] (09:25:25) 200-Running ioFTPD version
[R] (09:25:25) 200 Command successful.
[FTP_Custom_Commands]
version = EXEC ..\scripts\ioBanana.19\ioBanana.exe version
version = TCL ..\scripts\version\OnSiteVersion.itcl