gitlab markdown engine fails to work with html anchors

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Description of the problem

GitLab's markdown engine seems to ignore ids in anchor tags

### <a id=some-custom-id></a>some data

and replaces those with user-content-{{ title }}

<a id="user-content-some data" class="anchor" href="#some data" aria-hidden="true"></a>

Is there a way to turn off this "feature"?

Which Group/Project (with full path) is experiencing the issue?

https://gitlab.com/agorkov/anchors-in-markdown

See the html generated for

• https://gitlab.com/agorkov/anchors-in-markdown#index

It does not correspond to what's in the markdown document

• https://gitlab.com/agorkov/anchors-in-markdown/blob/master/README.md#L11

Thus breaking the navigation

Approximate date/time when the error occurred.

Today.

Describe what you were doing right before the issue occurred.

Created the markdown document.