Self-link fragments in Markdown files not working

[dpc]

I have a Markdown file that contains links across itself:

The [Fedimint federation](#Federation-Nodes)  ...


...

## Federation Nodes

This link works, even in my LSP, so I can jump to the header via that link.

However lychee doesn't like such links:

> lychee docs README.md --include-fragments --cache


[docs/architecture.md]:
   [ERROR] file:///home/dpc/fedimint/fedimint/docs/architecture.md#User-Client
   [ERROR] file:///home/dpc/fedimint/fedimint/docs/architecture.md#LN-Gateway
   [ERROR] file:///home/dpc/fedimint/fedimint/docs/architecture.md#Modules
   [ERROR] file:///home/dpc/fedimint/fedimint/docs/architecture.md#Federation-Nodes
   [ERROR] file:///home/dpc/fedimint/fedimint/docs/architecture.md#Crate-organization```

[mre]

Yup, sorry about that; fragments are currently broken.
See #1425 and #1457 etc.
I'm working on a fix at the moment.