Gitlab Handbook misinforms about Markdown?

From here: Handbook Markdown Guide | The GitLab Handbook

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Like one can use {#new-id} to add the id attr to the title.

But it simply doesn’t work. Instead of staying invisible, like the article predicts, they get rendered:

So this:

## Creating release branches {#create}

is producing this:

Any ideas?

P.S. Is there a way to get callouts working here in the Gitlab flavour of Markdown?

E.g.:

> [!NOTE]
> This is a note.