VLAN connectivity issues on vRACK between my dedicated servers

Has anyone had trouble with VLAN connectivity over vRACK?

Sending server (Server #1):

# arping 192.168.69.2 -c 1
ARPING 192.168.69.2 from 192.168.69.1 vmbr1.10
Sent 1 probes (1 broadcast(s))
Received 0 response(s)

Packet is sent, but the reply packet from Server #2 is missing the VLAN 10 header.

# sudo tcpdump -i enp8s0f1np1 -e -n -v
tcpdump: listening on enp8s0f1np1, link-type EN10MB (Ethernet), snapshot length 262144 bytes
23:37:44.531281 d8:43:ae:8a:6f:5f > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 46: vlan 10, p 0, ethertype ARP (0x0806), Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.69.2 (ff:ff:ff:ff:ff:ff) tell 192.168.69.1, length 28
23:37:44.531393 9c:6b:00:67:06:c2 > d8:43:ae:8a:6f:5f, ethertype ARP (0x0806), length 60: Ethernet (len 6), IPv4 (len 4), Reply 192.168.69.2 is-at 9c:6b:00:67:06:c2, length 46

Issue: Reply packet is stripped of the VLAN 10 header

Receiving server (Server #2):

# sudo tcpdump -i enp1s0f1np1 -e -n -v
tcpdump: listening on enp1s0f1np1, link-type EN10MB (Ethernet), snapshot length 262144 bytes
10:09:14.348946 d8:43:ae:8a:6f:5f > ff:ff:ff:ff:ff:ff, ethertype 802.1Q (0x8100), length 60: vlan 10, p 0, ethertype ARP (0x0806), Ethernet (len 6), IPv4 (len 4), Request who-has 192.168.69.2 (ff:ff:ff:ff:ff:ff) tell 192.168.69.1, length 42
10:09:14.348959 9c:6b:00:67:06:c2 > d8:43:ae:8a:6f:5f, ethertype 802.1Q (0x8100), length 46: vlan 10, p 0, ethertype ARP (0x0806), Ethernet (len 6), IPv4 (len 4), Reply 192.168.69.2 is-at 9c:6b:00:67:06:c2, length 28

Reply packet leaves server #2 with VLAN 10 header tag

So between Server #2 and Server #1, the reply packet is being stripped of VLAN header; either by the vRACK switches or possibly the network card itself. Server #1 is an Intel NIC while Server #2 is Broadcom. My network configuration appears correct as both servers are sending tagged packets out. Only Server #1 doesn't receive tagged packets, they come in untagged from the NIC. Server #2 receives tagged packets consistently.

Has anyone seen this issue before? I have had no luck with getting OVHCloud support to assist with this and I'm very much exhausted all other options in diagnosing the issue. For context I am running Proxmox 8 which is Debian based.

Thanks very much