When using tcpdump on proxmox host console and checking the interface vmbr0 while running "ping 8.8.8.8" inside a Debian VM, I see all the OUTGOING and INCOMING packets from VM and 8.8.8.8 responses.
17:18:04.854175 IP 44.55.66.16 > 8.8.8.8: ICMP echo request, id 1439, seq 1, length 64...