[bug report] el-tree default-checked-keys show unexpected
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Description
#20779
https://github.com/ElemeFE/element/blob/20c7cc9c5050c38b8066091972946bb35ec18c0a/packages/tree/src/model/node.js#L376
when use `default-checked-keys` with `lazy`, if set multi child select( >2), then all sibling child will checked
[online detail](https://codepen.io/genffy/pen/VwmWKZe?editors=1111)

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