element-ui tree component 
 after lazy rendering, set check-strictly 
 but calling setCheckedKeys still selects the parent node 
component introduces and sets
<el-tree
  ref="orgTree"
  :props="props"
  node-key="id"
  default-expand-all
  lazy
  :load="loadNode"
  show-checkbox
  check-strictly
  @check="checkChange"
  style="margin-top: 6px;">
</el-tree>set the selected keys
this.$refs.tree.setCheckedKeys([this.orgId],true);originally wanted to select only child nodes, but now the effect is
  
 
is there bug when element ui lazy loading and check-strictly are used together?
