'How to correctly merge dict with anchor in YAML

Please help merge dict with anchor in YAML to files, I try to do this but YAML return wrong result. Thanks for help

common_files: &common_files
    - file_path: "link -1"
      content_pattern:
      - "text"
      - "text"
      one: "zoo"
      two: "foo"
      three: "fii" 
    - file_path: "link -2"
      content_pattern:
      - "text"
      - "text"
      one: "zoo"
      two: "foo"
      three: "fii" 

files: 
    - <<: *common_files
    - file_path: "link-3"
      content_pattern:
      - "text"
      - "text"
      one: "zoo"
      two: "foo"
      three: "fii" 


Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source