A patternkit library definition's css and jss assets are not attached when rendering pattern

Problem/Motivation

A patternkit library definition's css and jss assets are not attached when rendering pattern. As a result, a patternkit pattern's twig template needs to use Drupal's attach_library() twig function to attach a specific patternkti pattern's assets.

Steps to reproduce

• Disable CSS and JS aggregation for convenient inspection of assets
• Install the patternkit_examlpe module
• Add a patternkit example pattern to a layout
• Render page with pattern
• Use browser dev tools, e.g. network tab to filter/search for declared patternkit_example library assets, e.g. patternkit.css
• Observe assets not included
• Expected patternkit.css included in page request

As a work-around, add block--patternkit.html.twig template in active theme and use {{ attach_library('patternkit_example/patternkit') }}.

Proposed resolution

TBD

Remaining tasks

TBD

User interface changes

TBD

API changes

TBD

Data model changes

TBD