I wonder how they managed to not reproduce it, it's clearly there:
/system script
add dont-require-permissions=no name="script saved using winbox" owner=sob policy=\
ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon source="line1\r\
\nline2\r\
\nline3"
add dont-require-permissions=no name="script saved using webfig" owner=sob policy=\
ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon source="line1\
\nline2\
\nline3"
add dont-require-permissions=no name="script saved using cli editor" owner=sob policy=\
ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon source="line1\
\nline2\
\nline3"
\r\n when saved in WinBox, \n otherwise.