I have tested your site and can confirm that the above patch fixes your case.
Or, it does not fix it entirely, ref. the log:
Failed to find GitInfo for "content/developer/API/_index.en.adoc"
Failed to find GitInfo for "content/developer/18. Best Practices.adoc"
Failed to find GitInfo for "content/developer/19. Performance Tweaks.adoc"
Failed to find GitInfo for "content/developer/20. Further Resources.adoc"
Failed to find GitInfo for "content/developer/21. Appendix A - Code Examples.adoc"
Failed to find GitInfo for "content/developer/22. Appendix B - API Methods.adoc"
But that is https://github.com/gohugoio/hugo/issues/4444
With a known workaround (rename). At least, with Hugo 0.37 it will not break everything.