[blueflow]

The HEAD value is not propagated by git operations (except for a fresh git clone). It is per-instance of a repository. If upstream changes, all other instances have to get fixed up manually.

You can't propagate (push/fetch will FAIL) a branch deletion to a repository if that branch is still referenced in the HEAD, and attempting to clone a repository where this has been forced will leave you in an empty directory with no checkout. This is the expected failure mode for all clones when a project changes to main and deletes master.

This is not specific to the main/master thing, it has always been a big pain, but with the main/master thing people started en masse to do it without technical necessity.