Incorrect duplicate key registered when using YAML anchors

[MostafaWael-CA]

Describe the bug

I receive a "Map keys must be unique" error highlight and tooltip when reference multiple YAML anchors at the same level within an element.

microservice_name:
    ...
    <<: *baseService
    <<: *baseIngress
   ...

Expected Behavior

It shouldn't mark them as duplicate keys.

Current Behavior

It marks them as duplicate keys.

Environment

• Windows
• Mac
• Linux
• other (please specify)

This is the same issue as issue 82