Unable to process schema when title is ambiguous

Describe the bug

Unable to process schema /components/schemas/ActualApprovement:

Could not find reference in parsed models or enums

Failure to process schema has resulted in the removal of:
/components/schemas/ActualApprovement

Reference(ref='#/components/schemas/backend__server__src__models__types__approvement__ApprovementStatus')

OpenAPI Spec File
A link to an OpenAPI document which produces this issue. Ideally, write a minimal reproduction only containing the problematic pieces.

{
  "components": {
    "schemas": {
      "backend__gateways__types__ApprovementStatus": {
        "type": "string",
        "enum": [
          "in_progress",
          "suspended",
          "rejected",
          "closed"
        ],
        "title": "ApprovementStatus"
      },
      "backend__server__src__models__types__approvement__ApprovementStatus": {
        "type": "string",
        "enum": [
          "pending",
          "approved",
          "rejected",
          "cancelled"
        ],
        "title": "ApprovementStatus"
      },
"ActualApprovement": {
        "properties": {
          "status": {
            "$ref": "#/components/schemas/backend__server__src__models__types__approvement__ApprovementStatus"
          }
        },
        "type": "object",
        "required": [
          "status",
        ],
        "title": "ActualApprovement"
      },
}}}

Desktop (please complete the following information):

• OS: Ubuntu 22.04
• Python Version: 3.9
• openapi-python-client version 0.27.1

Additional context
Add any other context about the problem here.

首先使用 issue 中的 OpenAPI 文档复现该失败，重点检查共享标题 "ApprovementStatus" 的两个 schema 的 schema 解析和引用解析。完成的标准是被引用的 enum 能够正确解析，并且 ActualApprovement schema 不会被移除。