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> Is a Github problem, not a git problem.

Git (the software) consists of two things. the git client (on your machine) and the git server (wherever you push).

It is most definitely not a GitHub problem if you pushed your changes to a local network git server, for example.

It's entirely possible to run git standalone, there's no hard requirement for there to be a git server that you push to.

Yep; plus changes can even be pushed/pulled between local directories (e.g. using 'file://'). Rewriting history can break all sorts of things.