Layout Paragraph gets classes from Layout Options

Problem/Motivation

This setting comes from layout options (defined in drowl_layouts_bs):

So this class goes to the LAYOUT attributes, what works well.
But the class goes to the paragraph attributes as well (paragraph--drowl-paragraphs-bs--layout.html.twig), what is wrong.

When I print the attributes in paragraph--drowl-paragraphs-bs--layout.html.twig:

   {% if attributes.hasClass('container--width-narrow') %}
      {{ dsm("paragraph attributes:") }}
      {{ dsm(attributes) }}
    {% endif %}

=> Nothing.

If I do this, one line later:

  <div{{ attributes.addClass(container_classes).removeClass('container--width-narrow') }}>

The class is gone. I have no idea whats going on.

Ressources:

• Layout Template
• Layout Options definition
• Layout Paragraph Template

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes