Github pages do not seem to work when certain files are modified

[JJ]

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I have been running this site for quite a long time, which explains why I'm deploying from the "old" gh-pages. I'll cut to the chase: it seems to trigger, and then deploy, only in some cases; when a file called index.md is modified, it does not even trigger.
Since this workflow does not seem to be controlled by a github action present in the repository, I have no idea what can be done about it, other than the workaround of actually modifying other file and see what happens. Or I may have missed some announcement by which these kind of deployment workflows became deprecated last week or so. Any way, help will be appreciated.

P.S. If there's something special about that file, is that it's generated by a post-commit hook and not present in the main branch. It's generated from README.md in the main branch, but could it be that it's triggered only when a file in the gh-pages branch which is also in the main branch is modified? It's a longshot, but I have no other explanation.

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