The example did collapse multiple zero sections for IPv4 as well (127.69), and IPv6 can also only collapse one block, namely the longest one,
The IPv4 example collapsed two “blocks”, “.000.000.”, or rather octets, and could do so because they were next to one another, which looks to behave the same way IPv6 does. In IPv6 the largest number of all zero hextets can be removed and replaced with double colons. So multiple hextets ( .0000) can be removed in shortening as long as they are next to one another in the IP address.
The IPv4 example collapsed two “blocks”, “.000.000.”, or rather octets, and could do so because they were next to one another, which looks to behave the same way IPv6 does. In IPv6 the largest number of all zero hextets can be removed and replaced with double colons. So multiple hextets ( .0000) can be removed in shortening as long as they are next to one another in the IP address.