触发连线时，线的起点位置偏离 BUG

[worthworld]

Describe the bug

注册自定义节点，点击 触发连线交互时，连线的起点位置偏离点击位置；
注：使用x6最新版本2.13.1时出现该bug，版本2.11.5 没有这个bug

Your Example Website or App

https://codesandbox.io/s/black-bush-t245jd?file=/src/shape.js:802-816

Steps to Reproduce the Bug or Issue

1、点击节点上具备 magnet=true 属性的元素，
2、拖拽，拉出连线

Expected behavior

作为用户，我期望拉出的连线起点在具备 magnet=true 属性的元素上，但我看到的时 连线的起点远离节点

Screenshots or Videos

Platform

• OS: [e.g. macOS, Windows, Linux]
• Browser: [e.g. Chrome, Safari, Firefox]
• Version: [e.g. 2.11.1]

Additional context

No response

[x6-bot]

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