Re-enable System theme file within a child theme

Solutions

One way of getting this to work is to add the CSS file as a part of your global-styling in custom_theme.libraries.yml

global-styling:
  css:
    theme:
      /core/modules/system/css/components/ajax-progress.module.css: {}

Hope this helps anyone who has come across this problem.

Tags: Theming / Drupal 8

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