Enabling Firewall breaks connection to all VMs

Hello,

I have a proxmox server running 7.4-13.
When I try to enable the firewall on datacenter level, all connections to my VMs break and I can't ping them. Even those VMs which have no firewall enabled in VM Firewall and Hardware settings. Also my NFS mount from my TrueNAS VM breaks.

Disabling the firewall and restarting the firewall with pve-firewall restart does not help.
Only restarting the entire server fixes the issue.

I have not set any rules and tried to set Input/Output policy to...

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