Auto-generated anchors with slashes produce malformed URLs with extra dash [v5-rc3] #2638

Description

Automatically generated anchors containing forward slashes (/), which worked correctly in Docsify v4, seem to be malformed in v5-rc3. The auto-generated anchor IDs are adding an extra dash (-) character, causing navigation links to fail.

Expected behavior

• Auto-generated anchor for 'Data / ML' should be: ?id=data-ml
• Clicking the link should navigate to the heading
• This worked correctly in Docsify v4

Actual behavior

• Auto-generated anchor for 'Data / ML' becomes: ?id=data--ml (note the double dash)
• Link fails to navigate to the target heading

Working (v4):
https://codesandbox.io/p/sandbox/docsify-v4-pages-with-slashes-dxw67d

Not working as Expected (v5-rc3):
https://codesandbox.io/p/sandbox/summer-haze-zwyh5f

Reference repository:
https://github.com/hanzili/canada_sde_intern_position

Please let me know if any additional info is needed, etc.

Steps to reproduce

1. Create a heading with a slash in the name: ## Data / ML
2. Use Docsify's auto-generated table of contents or anchor links
3. Click on the "Data / ML" link

Environment

No response

Additional Information

• Bug still occurs when all/other plugins are disabled?