Validation of required read-only field fails on request when the field is absent

Background:

Required read-only field is not mandatory in a request. Quoting the docs: https://swagger.io/docs/specification/data-models/data-types/

If a readOnly or writeOnly property is included in the required list, required affects just
 the relevant scope – responses only or requests only. That is, read-only required
 properties apply to responses only, and write-only required properties – to requests only.

The issue

Swagger validation fails with error key validation.request.body.schema.required if a field is not provided in the request and its schema is configured as readOnly and required. This is incorrect behavior.

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