PVE host cannot access internet through second bridge

I have a PVE host running with two NICs. I only use one at the moment and it has three virtual bridges. NIC1 has an untagged network (home network) and two tagged VLANs (VM network and VM isolated network). The purpose is that I can create VMs that can access my LAN (home network) and create other VMs that can access the internet using the VM network, where they can also access each other through that network. The third network is for VMs that can only access the internet, but not each...

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