crud.prefixRow和columns.fixed搭配使用时渲染异常

[ranwawa]

描述问题：

固定列在固定显示时,会丢失掉总结行,导致页面渲染错位

截图或视频：

如何复现（请务必完整填写下面内容）：

粘贴代码在官网即可复现

{
  "type": "page",
  "body": {
    "type": "crud",
    "syncLocation": false,
    "api": "/amis/api/mock2/sample",
    "loadDataOnce": true,
    "prefixRow": [
      {
        "type": "text",
        "text": "-"
      },
      {
        "type": "text",
        "text": "-"
      }
    ],
    "columns": [
      {
        "name": "id",
        "label": "ID",
        "fixed": "left"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      },
      {
        "name": "engine",
        "label": "Rendering engine"
      }
    ]
  }
}```

4. 操作步骤
请简单描述一下复现的操作步骤...

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