[BUG][GO] Missing attribute when using composed schema

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

When combining a composed schema (aPlusB) with a schema with more properties (d), attributes from combined schema (d) are ignored.

openapi-generator version

Discovered on 6.6.0
Also present in 7.0.0-20230622.013523-127 SNAPSHOT

OpenAPI declaration file content or url

openapi: 3.0.2
info:
  title: Test
  version: v1
paths:
  /test:
    get:
      operationId: get
      responses:
        "200":
          description: Get
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/e"

components:
  schemas:
    a:
      type: object
      properties:
        attA:
          type: string
    b:
      type: object
      properties:
        attB:
          type: integer
    aPlusB:
      type: object
      allOf:
        - $ref: "#/components/schemas/a"
        - $ref: "#/components/schemas/b"
    d:
      type: object
      allOf:
        - $ref: "#/components/schemas/aPlusB"
      properties:
        attD:
          type: string
    e:
      type: object
      allOf:
        - $ref: "#/components/schemas/d"
      properties:
        attE:
          type: integer

Generation Details

java -cp ${repo}/go-oapi-codegen.jar:${repo}/openapi-generator-cli.jar org.openapitools.codegen.OpenAPIGenerator generate \
    -i ./test-open-api.yml \
    -g go \
    -o ./output/ \
    --additional-properties=packageVersion=1.0.0,useOneOfDiscriminatorLookup=true,isGoSubmodule=true \
    --global-property apiTests=false

Steps to reproduce

1. Save the open api yaml as test-open-api.yml
2. Run the command to generate the code
3. Open file ./output/model_e.go

Expected struct

type E struct {
    AttE *int32 `json:"attE,omitempty"`
    AttD *int32 `json:"attE,omitempty"`
    AttA *string `json:"attA,omitempty"`
    AttB *int32 `json:"attB,omitempty"`
}

Actual struct

type E struct {
    AttE *int32 `json:"attE,omitempty"`
    AttA *string `json:"attA,omitempty"`
    AttB *int32 `json:"attB,omitempty"`
}

Related issues/PRs

Suggest a fix

Use the supplied test-open-api.yml with the OpenAPIGenerator generate command and the Go generator, then inspect output/model_e.go. Compare the generated E struct with the expected attributes, especially AttD, and consider the issue resolved when regeneration includes properties inherited through the composed schemas.