Enum does not get added when using v3.1 flag

[hLittle]

Describe the bug
Enum values do not get added when using v3.1 flag on 2.0.0-rc4

To Reproduce
Reproduction code:

package main

import (
	"log"
	"net/http"
)

type EnhancementType string // @name EnhancementType

const (
	Foo EnhancementType = "FOO"
	Bar EnhancementType = "BAR"
)

type Enhancement struct {
	EnhancementType EnhancementType `json:"enhancement_type" example:"FOO"`
}

// Enhance - handler for /
// @Summary Example Data
// @Tags         example
// @Accept       json
// @Produce      json
// @Param        enhance  body      Enhancement  true  "Enhancement Request Body"
// @Success      200  {object}  Enhancement
// @Failure      400  {object}  object
// @Failure      404  {object}  object
// @Failure      500  {object}  object
// @Router / [post]
func example(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte("{\"enhancement_type\": \"BAR\"}"))
}

func handleRequests() {
	http.HandleFunc("/", example)
	log.Fatal(http.ListenAndServe(":10000", nil))
}

// @title Swagger Example API
// @version 1.0
// @description This is a sample server

// @host localhost:10000
func main() {
	handleRequests()
}

Command:

 swag init -d ./ -g ./main.go -o ./docs --parseDependency --parseInternal --parseDepth 3 --v3.1 --ot yaml,go

Expected behavior
Enum is generated

  EnhancementType:
    enum:
    - FOO
    - BAR
    type: string
    x-enum-varnames:
    - Foo
    - Bar

Actual behavior
Adds x-enum-varnames but not enum:

components:
  schemas:
    main.Enhancement:
      properties:
        enhancement_type:
          $ref: '#/components/schemas/main.EnhancementType'
      type: object
    main.EnhancementType:
      example: FOO
      type: string
      x-enum-varnames:
      - Foo
      - Bar

Your swag version
2.0.0-rc4

Your go version
go version go1.23.2 darwin/arm64

Desktop (please complete the following information):

• OS: macOS Sonoma
• Browser: N/A
• Version: N/A