Problem with switching off-grid, on-grid

I have a 3xMP II 5000VA configured for 3ph operation. I was using a virtual switch for off-grid operation. But now I needed to set up assistants to control a small relay that switches something, so I can no longer use the virtual switch, instead I configured another assistant Start-stop generator, which basically does the same thing as the virtual switch for ignore AC-input. The inverters are supposed to phase-lock to the grid if any of them is overloaded. This works, but only on L1, if L2 or L3 is overloaded, nothing happens. It doesn’t matter if the assistant Start-stop generator is on all inverters, or only on L1. I tried setting the same thing via a programmable relay, but it behaves exactly the same. In the original setting via virtual switch ignore AC-input, this setting had to be only on L1, but if any inverter was overloaded, it always phase-locked to the grid. The question is how to make it work via the Assistant.

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