Because hostname and timezone are both string types, they are being confused by the parser, even though timezone parsing should throw an exception if an invalid value (such as a hostname) is encountered.

If you observe here even though hostname is localhost it’s not considered as hostname since it was parsed as timezone and exception was thrown and further it has got parsed:

This is parsed correctly:

If we keep hostname first and time zone we can see following, hostname is parsed correctly:

But here time zone is considered as hostname: