add ipv6 network to zone transfer list

[smithxx]

I am on the page:

Add to Common Allow Zone Transfer ACL
Enter IP or network address:
For example, 2002:7b7b:7b7b::1, 123.123.0.0/16, 123.123.123.123/32, 123.123.123.123


However, when i enter an IPv6 network such as:

2002:7b7b:7b7b::/64

i get an error that the input is not valid. it will accept individual ipv6 addresses but I cannot get it to accept an Ipv6 network.

 

[abdi]

it will accept individual ipv6 addresses but I cannot get it to accept an Ipv6 network.

May it's because it should not accept a network class.