In order to make child theme changes to work when Minifiy option is enabled, check the following steps:

  1. Create style.min.css file by copying css from style.css file and convert it.

We created style.min.css  using this site: https://cssminifier.com/ 

Upload style.min.css file in child theme folder.

2. Replace get_template_directory_uri from child theme with get_stylesheet_directory_uri

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3. Replace style.css with style.min.css

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