Problem with request header in build-in validation

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Hello,
I encountered issue in request validation against the OpenAPI specification in the APIs section.
In the APIs section, I have created an API where I have an OpenAPI specification and a collection.

After sending the request, I receive the following validation error:
“The required header “PSU-ID” was not found in the transaction”

but according to the schema, this parameter in the header is not required.

PSU-ID:
      name: PSU-ID
      in: header
      description: |
        Client ID of the PSU in the ASPSP client interface. 
      schema:
        type: string
      required: false
      example: "PSU-1234"

It seems that during validation, postman does not consider whether the parameter in the header is required or not.

Is it a bug or am I doing something wrong?
Thank you