pipewire does not create nodes from pipewire.conf

PipeWire version (pipewire --version): 0.3.40
Distribution and distribution version (PRETTY_NAME from /etc/os-release): Fedora 35
Desktop Environment: Gnome
Kernel version (uname -r): 5.15.12-200.fc35.x86_64

Description of Problem:

I'm trying to create a single-node virtual device as described in https://gitlab.freedesktop.org/pipewire/pipewire/-/wikis/Virtual-Devices

I can easy do it with pw-cli

pw-cli create-node adapter '{ factory.name=support.null-audio-sink node.name="virtual-mic" node.description="Virtual Microphone" media.class=Audio/Source/Virtual object.linger=true audio.position=[FL FR] }'

pw-cli ls Node returns:

...
	id 64, type PipeWire:Interface:Node/3
 		factory.id = "18"
 		node.description = "Virtual Microphone"
 		node.name = "virtual-mic"
 		media.class = "Audio/Source/Virtual"
...

But I cann't force pipewire to create this device automatically upon restart. I have the entry in my ~/.config/pipewire/pipewire.conf

    { factory = adapter
        args = {
            factory.name     = support.null-audio-sink
            node.name        = "virtual-mic"
            node.description = "Virtual Microphone"
            media.class      = "Audio/Source/Virtual"
            object.linger    = true
            audio.position   = "FL,FR"
        }
    }

but it does'n work: after restarting pipewire there is no such node in pw-cli ls Node output

How Reproducible:

Always

Steps to Reproduce:

Copy /usr/share/pipewire/pipewire.conf to ~/.config/pipewire/pipewire.conf

Add the folowing node in the context.objects = [:

{ factory = adapter
  args = {
      factory.name     = support.null-audio-sink
      node.name        = "virtual-mic"
      node.description = "Virtual Microphone"
      media.class      = "Audio/Source/Virtual"
      object.linger    = true
      audio.position   = "FL,FR"
  }
}

restart pipewire with systemctl --user restart pipewire.socket
Check the node existance with pw-cli ls Node

Actual Results:

There is no node with the name "virtual-mic"

Expected Results:

a node with node.name = "virtual-mic"

Additional Info (as attachments):

[pw-dump.log](/uploads/4fd174adacdb252c9200185e34e09825/pw-dump.log)