地图 visualmap设置 split number设置为5 但是只显示4段 这是为啥

[xiaosongdhls]

This issue is not created by echarts-issue-helper and will be soon closed.

[github-actions]

This issue has been automatically marked as stale because it did not have recent activity. It will be closed in 7 days if no further activity occurs. If you wish not to mark it as stale, please leave a comment in this issue.

[github-actions]

This issue has been automatically closed because it did not have recent activity. If this remains to be a problem with the latest version of Apache ECharts, please open a new issue and link this to it. Thanks!