A bridge does not have ipv6 link local address when ipv4 address is in place - nmcli related

Issue

When a bridge is created via nmcli with ipv4.method manual, ipv4.addresses A.B.C.D/24 and ipv6.method link-local, no link-local address is present on the bridge.

# nmcli connection add type ethernet con-name ens10 ifname ens10
# nmcli connection modify ens10 ipv4.method manual ipv4.addresses 10.75.99.1/24 ipv6.method link-local
# nmcli connection up ens10
 
# nmcli connection show
NAME   UUID                                  TYPE      DEVICE
ens10  17f38a69-4334-41ca-aedc-9b8b878d1c7f  ethernet  ens10  
 
ens10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:25:80:58 brd ff:ff:ff:ff:ff:ff
    altname enp0s10
    inet 10.75.99.1/24 brd 10.75.99.255 scope global noprefixroute ens10
       valid_lft forever preferred_lft forever
    inet6 fe80::b4af:5fd8:a613:53a8/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
 
# nmcli connection add type vlan con-name ens10-vlan ifname ens10.999 id 999 dev ens10
# nmcli connection modify ens10-vlan ipv4.method manual ipv4.addresses 10.75.99.1/24 ipv6.method link-local
# nmcli connection up ens10-vlan
 
# nmcli connection show
NAME        UUID                                  TYPE      DEVICE    
ens10       17f38a69-4334-41ca-aedc-9b8b878d1c7f  ethernet  ens10    
ens10-vlan  f173ee66-3411-4d55-8c3f-393ed9d2929f  vlan      ens10.999
 
ens10.999@ens10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 52:54:00:25:80:58 brd ff:ff:ff:ff:ff:ff
    inet 10.75.99.1/24 brd 10.75.99.255 scope global noprefixroute ens10.999
       valid_lft forever preferred_lft forever
    inet6 fe80::4ea5:8225:621e:abe8/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
 
# nmcli connection add type bridge con-name br0 ifname br0
# nmcli connection modify br0 ipv4.method manual ipv4.addresses 10.75.99.1/24 ipv6.method link-local
# nmcli connection up br0
 
# nmcli connection show
NAME        UUID                                  TYPE      DEVICE    
 
ens10       17f38a69-4334-41ca-aedc-9b8b878d1c7f  ethernet  ens10    
ens10-vlan  f173ee66-3411-4d55-8c3f-393ed9d2929f  vlan      ens10.999
br0         0d5a7e95-75c5-4660-8a96-ab95d8a0892f  bridge    br0      
 
br0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether be:c0:7e:de:c2:ee brd ff:ff:ff:ff:ff:ff
    inet 10.75.99.1/24 brd 10.75.99.255 scope global noprefixroute br0
       valid_lft forever preferred_lft forever