[REQ] [C#] Deserialize JSON empty array associated with additionalProperties

Is your feature request related to a problem? Please describe.

I use openapi-generator 4.3.1 to generate a C# client from a yaml file (OpenAPI V3) with additionalProperties inside. A Dictionary<Tkey, Tvalue> is created with an ojbect as Tvalue.
eg:
yml:

debug-item-bean:
        tokens:
          type: object
          description: tokens
          additionalProperties:
            type: object
            description: debug-item-bean tokens dictionary
            properties:
              key:
                type: string
              value:
                type: array
                items:
                  type: string

C#:
Dictionary<string, DebugItemBeanTokens>

If the response of the endpoint has "tokens": [], I recevie an error:
Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'Tokens' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.
So I should modify
Dictionary<string, DebugItemBeanTokens>
to
Dictionary<string, List<string>>

Describe the solution you'd like

I want to have an option to control empty arrays [] in openapi-generator, for class created from additionalProperties.

Has this issues done in the version 5.0.0?

Start by reproducing the OpenAPI V3 YAML example with the C# generator and an endpoint response where tokens is []. Inspect the generated Dictionary<string, DebugItemBeanTokens> handling for additionalProperties and compare behavior in version 5.0.0. Done means an explicit option controls empty-array deserialization for these generated classes, with the resulting behavior documented or covered by a regression test.