Anchor links only working with extension

[Kamik423]

Say I am writing foo.md and I want to reference bar.md. I can reference that file with [](bar.md) or [](bar). If I now however want to reference the heading heading in bar.md, [](bar.md#heading) works perfectly, but [](bar#heading) does not.

I am using

myst-parser==2.0.0
Sphinx==6.2.1

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