The "mfd.settings" plugin does not exist

For a few drush commands like drush locale-update, I have the following error:

> In DiscoveryTrait.php line 52:
>
>   The "mfd.settings" plugin does not exist.

The mfd.schema.yml seems to be the problem. When I remove the file, drush is happy.
I'm not sure what the type: boolean with a label: 'All Publish' for 'value' should describe ? The 'mfd.settings' at the beginning is to describe the settings.yml, isen't it? But I don't think there is a 'value' in it and I'm not an expert of schema.yml but it doesn't look right.

Shouldn't it be more like:

mfd.settings:
  type: config_object
  label: 'MFD Settings'
  mapping:
    display_label:
      type: boolean
      label: 'Something'

Or maybe was it to describe something in the field?

Either way it seems malformed.