Lost client ip6 connect after PC reboot

[buga]

How to set right proxmox ip6 gateway for linux bridge opnsense fe80::be24:11ff:fe8e:c11c

Client
ping -6 fe80::be24:11ff:fe8e:c11c
no reach

opnsense restart (in PROXMOX VM)
ping -6 fe80::be24:11ff:fe8e:c11c
 fe80::be24:11ff:fe8e:c11c: time<1ms
 fe80::be24:11ff:fe8e:c11c: time<1ms

Client reboot
ping -6 fe80::be24:11ff:fe8e:c11c


i have two interfaces

gif0: flags=1008051<UP,POINTOPOINT,RUNNING,MULTICAST,LOWER_UP> metric 0 mtu 1280
......
        inet6 fe80::be24:11ff:fe8e:c11c%gif0 prefixlen 64 scopeid 0x9
      
      
vtnet0: flags=1008843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu ......
        inet6 fe80::be24:11ff:fe8e:c11c%vtnet0 prefixlen 64 scopeid 0x1      
no reach

That is, I need to reboot both the computer and the router so that IP6 works. Why is this and how can I fix it?