Bug with two veth on Alpine Linux LXC container

[pulsar]

Hello,

I recently created a new LXC container with Alpine Linux on Proxmox 5.1-51.
When I'm rebooting the container from "reboot" command, Proxmox crash and daemon.log says that:

Apr 22 12:37:31 ns3003000 systemd[1]: Stopped PVE LXC Container: 7001.
Apr 22 12:37:31 ns3003000 systemd[1]: Starting PVE LXC Container: 7001...
Apr 22 12:37:31 ns3003000 ntpd[2820]: Deleting interface #18 vmbr7, 192.168.7.254#123, interface stats: received=0, sent=0, dropped=0, active_time=178101 secs
Apr 22 12:37:31 ns3003000 ntpd[2820]: Deleting interface #19 vmbr7, fd00::7:254#123, interface stats: received=0, sent=0, dropped=0, active_time=178101 secs
Apr 22 12:37:31 ns3003000 ntpd[2820]: Deleting interface #20 vmbr7, fe80::c46:7dff:feae:659b%6#123, interface stats: received=0, sent=0, dropped=0, active_time=178101 secs
Apr 22 12:37:33 ns3003000 systemd-udevd[29776]: Could not generate persistent MAC address for vethW0BJQ7: No such file or directory
Apr 22 12:37:33 ns3003000 systemd-udevd[29878]: Could not generate persistent MAC address for vethVGS3UR: No such file or directory
Apr 22 12:38:00 ns3003000 systemd[1]: Starting Proxmox VE replication runner...
Apr 22 12:38:00 ns3003000 systemd[1]: Started Proxmox VE replication runner.
Apr 22 12:38:13 ns3003000 systemd[1]: Started Session 12601 of user root.
Apr 22 12:38:14 ns3003000 systemd[1]: Started Session 12602 of user root.
Apr 22 12:38:14 ns3003000 systemd[1]: Started Session 12603 of user root.
Apr 22 12:39:00 ns3003000 systemd[1]: Starting Proxmox VE replication runner...
Apr 22 12:39:00 ns3003000 systemd[1]: Started Proxmox VE replication runner.
Apr 22 12:39:01 ns3003000 systemd[1]: pve-container@7001.service: Start operation timed out. Terminating.
Apr 22 12:39:01 ns3003000 systemd[1]: Failed to start PVE LXC Container: 7001.
Apr 22 12:39:01 ns3003000 systemd[1]: pve-container@7001.service: Unit entered failed state.
Apr 22 12:39:01 ns3003000 systemd[1]: pve-container@7001.service: Failed with result 'timeout'.

Thanks for your help.