Changing the netmask of a Virtual IP does not apply change

[CRCinAU]

Consider the following configuration:

This results in the following IP addresses set on the LAN interface:

        inet6 fe80::1%vtnet0 prefixlen 64 scopeid 0x1
        inet6 fe80::53%vtnet0 prefixlen 64 scopeid 0x1

If you change the subnet mask, and then hit Apply, nothing on the system changes:

The system is still configured as:

        inet6 fe80::1%vtnet0 prefixlen 64 scopeid 0x1
        inet6 fe80::53%vtnet0 prefixlen 64 scopeid 0x1

Removing and adding the aliased addresses again works as expected.

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[AdSchellevis]

for some reason ifconfig doesn't accept changes here, example output when changing 128 to 120 (or anything else):

# /sbin/ifconfig vtnet2 inet6 'ffff:ffff:fffff::4f31' prefixlen '120' alias vhid '3'
ifconfig: ioctl (SIOCAIFADDR): Invalid argument