Wrong version for combined form of ipv6 ('2001:db8:0000:4444:5555:6666:1.2.3.4')

For combined form of ipv6 **'2001:db8:0000:4444:5555:6666:1.2.3.4'** IP.version() returns 4.
<img width="574" height="461" alt="Image" src="https://github.com/user-attachments/assets/091475b9-dcca-4ccf-adf8-57b01d839a62" />
