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84079dbff3
The test's `rm -rf "$NVM_DIR"` intermittently failed with `rm: cannot remove...: Directory not empty` and aborted under `set -e`. Cause: after the clone/fetch, git can spawn a detached background gc/maintenance process that keeps writing into the clone dir while `rm -rf` runs (a concurrent writer makes the final rmdir fail). It is not egress- or version-related (it reproduces with all endpoints allowed), and it is environment-timing dependent (recently became consistent on the GitHub runners). Disable git's background work for the test (gc.autoDetach / maintenance.auto) so all git operations finish synchronously, and retry the rm once as a safety net.