When EnableDiscriminatorValue is set to true all types end up with a required property of odata.type

My understanding is odata.type is only required in the case the type cannot be determined such as it being a type derived from the specified type.

When using EnableDiscriminatorValue = true I get correctly odata.type used as a discriminator when a type has a derived type.
I also get however for seemingly all types, odata.type included as a required property.

Assemblies affected

v1.1.0

Steps to reproduce

1. Create an odata model with no derived types.
2. Generate an Open API specification from the model with EnableDiscriminatorValue = true.

Expected result

I would only expect odata.type to be required in the case a type is a derived type.

Actual result

odata.type is set as required for all types.

If I use Open API connected services in Visual Studio with the specification to generate a client, the client will fail to deserialize responses missing the required property by default.

Additional detail

This can be worked around in most case.

Start by reproducing the issue with an OData model that has no derived types and EnableDiscriminatorValue set to true, then inspect the generated OpenAPI specification. Trace how discriminator metadata becomes a required property; done means odata.type is required only where derived types make it necessary, without breaking valid client deserialization.