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I believe they use semantic (Haskell program that uses tree-sitter) for navigation: https://github.com/github/semantic

So the answer may be that semantic does not yet have support for the language in question.

correct. adding support for new language is a matter of opening up a pull-request with the appropriate gluecode. https://github.com/github/semantic/blob/793a876ae45d38a6bd17...

It would be more realistic to think of pull requests if github allowed per-repo configs with custom parsing scripts, similar to gitLab LSIF support - https://docs.gitlab.com/ee/user/project/code_intelligence.ht.... Otherwise, how can a contrioutor be sure that his pull request really produces convenient code navigation in github UI. There is no way to test it.

The Semantic seems not used anymore:

> During this time, the team migrated from a Semantic-based tagging service to one that operated entirely with (newly developed) Tree-sitter queries. Though Semantic performed well, using the Tree-sitter query language allowed faster iteration and avoided the operational overhead of a program-analysis framework.

https://queue.acm.org/detail.cfm?id=3487022

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