孤立节点添加连线后，展开/收缩功能出错

[underwater133]

如题，如果是先创建节点A，再创建节点B，然后连线A->B，那么展开/收缩按钮在A的下方，是正常的。但如果反过来连线B->A，此时展开/收缩按钮还是在A的下方，并且如果是收缩所有节点的情况下，也是展示的A节点，而不是B节点。我测试结果是和创建节点顺序有关系，展开/收缩按钮会出现在先创建的节点下方，并且优先展示该节点。这是什么情况，应该如何解决？
如图，我是先创建的10，再创建的11：

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