[BUG] Field declare as Date is not Recognize as isDate is mustache

Field declare as Date is not Recognize as isDate is mustache.

1. Spec has field of type Date .
2. we have written our own converter by extends SpringCodegen implements CodegenConfig
3. Once we run generator we are noticing that the model json is not update isDate property as true for "openApiType" : "Date",

yaml

        generatorTime:
          deprecated: true
          format: date-time
          type: string

model json

      "openApiType" : "Date",
      "baseName" : "generatorTime",
      "isDate" : false,
      "isDateTime" : false,
      

Mustache

{{#isDate}}
  @JsonProperty("{{baseName}}")
 {{/isDate}}

now above mustache condition failed since isDate is false. right now i am using openapi-generator-5.4.0 version .

Start with the custom SpringCodegen implementation and the supplied YAML field, then run openapi-generator 5.4.0 and inspect the model JSON metadata. Compare how the generator classifies date and date-time fields before the Mustache template is rendered. Done means the documented Date field produces the expected isDate value and the template condition behaves accordingly.