Show_name of entity-button not working

I am using entity-buttons to call services. I want some buttons to only contain the icon so I configure them like this :

- type: entity-button  
    entity: ir_client.connected
    icon: mdi:power
    show_name: false
    color: rgb(28, 128, 199)
    tap_action:
      action: call-service
      service: ir_client.send_command

It seems that the show_name:false is not taken into account as I still see the entity name :
Screenshot_20190321_163754

Thereā€™s an open PR about this.
https://github.com/home-assistant/home-assistant-polymer/pull/2936
Looks like the Docs update was faster.