Host and Guest MTU problems with OVSSwitch setup

I have an interesting one that I am hoping someone can point me in the right direction on.

I have a cluster of three pve hosts on vlan1, and some guests on both vlan1 and vlan2. MTU is set to 9000 across the board. Guest VM's on vlan1 can communicate "correctly" with the host PVE machines, ping correctly using a manual packet size (ping -s 8972 -M do 192.168.0.92). However, guests on vlan2 cannot communicate with the pve hosts on vlan1, nor any guests, nor external hosts on vlan1.

So I...

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