standalone.bat has these lines:

:READ-DEBUG-PORT
set "DEBUG_MODE=true"
set DEBUG_ARG="%2"
if not "x%DEBUG_ARG" == "x" (
   if x%DEBUG_ARG:-=%==x%DEBUG_ARG% (
      shift
      set DEBUG_PORT=%DEBUG_ARG%
   )
   shift
   goto READ-ARGS
)

which are not working properly. Replace them with these:

:READ-DEBUG-PORT
set "DEBUG_MODE=true"
if not "%2" == "" (
   if not "%2:~0,1" == "-" (
      set DEBUG_PORT=%2
      shift
   )
   shift
   goto READ-ARGS
)