Routing changes not correctly applies

[Frank-Krick]

Link deletion on metadata changes for group and input channel selection doesn't delete links most of the time.

This seems to be cause by an object manager in the lua script not seeing the existing links.

        local source_port_id = tonumber(source_port.properties["object.id"])
        print("Found source port, removing existing links for port",
                source_port_id)
        for link in MyObjectManager:iterate(
                Interest({
                    type = "link",
                    Constraint({ "link.output.port", "=", source_port_id }),
                })) do
            print("destroying existing link")
            link:request_destroy()
        end

This is in wireplumber/pmx_manage_connections.lua