Some characters in the address linked from TOC are deleted and the link cannot be made.

[TsNeko]

What is the problem?

Some characters in TOC linking addresses have been removed so that it is no longer possible to link to a chapter from the TOC in the preview.

How can I reproduce it?

example of .md file

<!-- TOC depthFrom:1 depthTo:3 -->

- [１・２](#１２)
 
<!-- /TOC -->

# １・２

Presumably, #１２ is bad and #１・２ is right.
The unicode of ・ is U+30FB.

[yzhang-gh]

Actually on GitHub, the anchor is #１２. Are you using Markdown somewhere else?

BTW, it looks like you are also using another TOC extension. (This extension doesn't add/recognize comments like <!-- TOC ... -->, /TOC.)

[TsNeko]

I solved this problem by matching the Markdown All in One setting to the Markdown preview feature built into the vscode.

Markdown All in One 3.0.0 recognizes <!-- TOC ... -->.
I don't have Markdown TOC (AlanWalk) installed.

Also, <!-- TOC ... --> in another .md file didn't recognized, so I installed Markdown TOC (AlanWalk).
To set slugifyMode to vscode works correctly.