CD /d failing inside a .cmd script

I'm stued with a glitch I've come across
while creating some network traffic capture scripts (.cmd)
Windows NT6x, Windows 7 and up (tested in Windows 7/8/10)

A plain simple:

CD /d x:nettools

is not working to change to "x:" drive
and jump to foler "nettools"
also no error is reported (not even in ERRORLEVEL)

Any ideas ???