False positive about link fails?

[leemthompo]

Describe the bug

@craigtaverner has a link like this.

[`AVG`](../../esql-functions-operators.md#esql-avg)

where [esql-avg] is defined in a snippet file

1. The link works
2. Build errors with

:: fail: Documentation.Builder.Log[0] esql-avg does not exist in esql-functions-operators.md.
(/Users/craig/dev/elastic/asciidocalypse/docs/elasticsearch/docs/reference/query-languages/esql/_snippets/lists/aggregation-functions.md:1)

But clicking on AVG in either the dropdown list, or the list further down the page, works fine. So the links work. No idea why it prints this error.

Expected behavior

Should either fail with broken link or not fail given link works.

Steps to reproduce

1. Create a snippet file with a custom anchor
2. Include that in a parent file
3. Link to that custom anchor from another page

Tooling

• docs-builder
• migration tooling
• I'm not sure

[leemthompo]

See https://github.com/elastic/asciidocalypse/pull/109