IGD - reporting only internal traffic

I'm trying to show transfer speeds in HomeAssistant using IGD. It worked, I had to reset my router and now it shows just traffic from router itself. Few kbps, much more when for example installing packages.

Is there a way to choose interface I want to use for IGD?

I'm on last 19.7, as 20+ doesn't boot on my device (there was a target swap since 20 and I can't make it run).