TimeMachine backups failing

I just migrated my long running NAS system from TrueNAS Scale to Proxmox (8.2-1). Everything is working with the exception of my Mac backups. TimeMachine will run for a few minutes, copying files to the SMB share, before stopping ("The backup disk may have been ejected or disconnected from the computer."). This LXC is running Debian 12 and has avahi-daemon installed (with a default config). The NFT firewall is disabled. Restarting avahi will get things running again for a few more minutes...

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