Certain truncated clients on physical switch not accessible from PVE or VMs

I'm having no luck connecting to certain devices connected to my physical switch from the PVE shell, and other Ubuntu VMs. Here's the whole picture:

Modem -> Proxmox (running OpnSense & Ubuntu for an Omada Controller via Docker) <-> 2 Netgear switches



Everything is working fine from the OpnSense VM. I can ping the 3 WAPs (Netgear-1 ports 1-3) from any of the workstations and servers not involved with Proxmox, but from Proxmox itself and the Ubuntu VM, I get no reply not only...

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