Combo drill-down back level display problem

[evilpose]

Describe the bug / 问题描述

When the combo is collapsed and all the internal elements are deleted, the combo is opened again and the internal elements are redrawn. It is found that there is a problem with the edge level, which is always 1. However, the combo and the point are not affected.

Reproduction link / 重现链接

No response

Steps to Reproduce the Bug or Issue / 重现步骤

No response

G6 Version / G6 版本

🆕 5.x

Operating System / 操作系统

macOS

Browser / 浏览器

Chrome

Additional context / 补充说明

No response