Bootstrap 4 折叠引导和SimpleBar js不能一起工作

我对simplebar.js（）和bootstrap collapse元素有异议。 自定义滚动不显示（但已初始化），但默认滚动显示

使用默认滚动（单击项目1和项目2）：

使用simplebar.js：

<div class="container" style="height:300px; overflow:auto;">
    <ul class="nav nav-pills flex-column">
  <li class="nav-item">
    <a class="nav-link" data-toggle="collapse" href="#item-1">Item 1</a>
    <div id="item-1" class="collapse">
      <ul class="nav flex-column ml-3">
        <li class="nav-item">
          <a class="nav-link active" href="#">Sub 1</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Sub 2</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Sub 3</a>
        </li>
      </ul>
    </div>
  </li>
  <li class="nav-item">
    <a class="nav-link"  data-toggle="collapse" href="#item-2">Item 2</a>
    <div id="item-2" class="collapse">
      <ul class="nav flex-column ml-3">
        <li class="nav-item">
          <a class="nav-link active" href="#">Sub 1</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Sub 2</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#">Sub 3</a>
        </li>
      </ul>
    </div>
  </li>
  <li class="nav-item">
    <a class="nav-link" href="#">Item 3</a>
  </li>
  <li class="nav-item">
    <a class="nav-link disabled" href="#">Item 4</a>
  </li>
</ul>
</div>