Cannot link to RST sections since 0.17.0

[JulianGro]

What version of myst-parser are you using?

2.0.0

What version dependencies are you using?

Sphinx 6.2.1

What operating system are you using?

Linux

Describe the Bug

On myst-parser versions before 0.17.0, you can link to RST sections via something like:

[Load and Run a Script](get-started-with-scripting.html#load-and-run-a-script)

This was broken in 0.17.0 #519 (comment)
As far as I can tell, there is still no way to link to RST sections again. It looks like the following should work:

[Load and Run a Script](get-started-with-scripting.rst#load-and-run-a-script)

But that throws a warning and breaks the link:

WARNING: local id not found in doc 'script/get-started-with-scripting': 'load-and-run-a-script' [myst.xref_missing]

Expected Behavior

[Load and Run a Script](get-started-with-scripting.rst#load-and-run-a-script)

should just link to the "load-and-run-a-script" section.

To Reproduce

Here are two example files that should reproduce the issue in a minimal project:
RST_MD_example.zip

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[sumezulike]

Can you provide a full minimal example? Your example includes a lot of unnecessary stuff and link generation works for me when I remove the references to non-existing files.

[JulianGro]

It indeed seems like the following syntax works now:

+ [Load and Run a Script](get-started-with-scripting.rst#load-and-run-a-script)

However, it does still throw a warning:

myst-test/source/write-scripts.md:3: WARNING: local id not found in doc 'get-started-with-scripting': 'load-and-run-a-script' [myst.xref_missing]

Here is a full minimal example:
myst-test.zip
write-scripts.md tries to link to a section in the RST, which throws a warning.
The README has instruction on how to build the documentation.

Not sure if I saw the warning and assumed that it wouldn't work, if a theme we use breaks it, or if it was broken in the past while still throwing the same warning.

[sumezulike]

I could verify that (seemingly?) unnecessary warnings are being printed, I'll try to write a fix for that. The links all seem to work, though.