WARNING: 'myst' cross-reference target not found: 'level-4-header-title' [myst.xref_missing] about myst-parser HOT 4 OPEN

Oh, thanks! That solves it perfectly.

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I get the same, not specifically for 4-level headers, but also 2-level headers.

Note: A warning != error. What is happening here does not break any functionality.

I suspect this is the case for all implicit targets. Possibly they are not resolved during Sphinx build time but only in the generated HTML.

• Since implicit targets are documented as a feature, I would expect a warning only if I used something incorrectly. If these warnings are inherent to implicit targets, it would be nice to mention this in the documentation (below the "discouraged" block).
• I try to care about and resolve warnings so that I don't oversee a new and important one. For that, it is important not to get flooded with irrelevant warnings. It would be great there is something that can be done to avoid emitting this warning at build time.

from myst-parser.

Increasing the myst_heading_anchors variable to the deepest level could get rid of the warnings, it's currently 0 by default. See MyST Configuration

from myst-parser.