Checkout branch checks out "(no branch)"

レポートに示されている CommitChanges と GetBranch のエントリポイントから始め、次に LibGit2Sharp 0.27.2 を使用して Ubuntu パイプライン環境で checkout を再現し、Windows 10 と比較します。GetBranch が返すブランチと checkout の結果を追跡します。完了の条件は、その後のログとコミットが "(no branch)" ではなく、要求されたブランチに残ることです。

I encountered a Bug where Checkout would not checkout the provided branch, but rather nothing (?). This somehow does not occur on my local dev-machine, but only on our pipeline agent.

Reproduction steps

This is my code to commit my changes

public Commit? CommitChanges(SemVersion newVersion)
{
    using var repo = new Repository(_executionSettings.Git.CloneTarget);
    _logger.LogInformation("{head}", repo.Head.FriendlyName);
    var status = repo.RetrieveStatus();
    if (!status.IsDirty)
    {
        _logger.LogInformation("No changes in repository, skipping commit");
        return null;
    }

    var targetBranch = LibGit2Sharp.Commands.Checkout(repo, GetBranch(repo, _executionSettings.Git.TargetBranch));
    _logger.LogInformation("{head}", repo.Head.FriendlyName);
    LibGit2Sharp.Commands.Stage(repo, new[]
    {
        _executionSettings.FileNames.Changelog,
        _executionSettings.FileNames.Version
    });

    var author = new Signature("Version Agent", "versionagent@example.com", DateTimeOffset.Now);
    var commitMessage = $"chore(release): Released {newVersion} to production";
    _logger.LogInformation("{head}", repo.Head.FriendlyName);
    var commit = repo.Commit(commitMessage, author, author);
    _logger.LogInformation("{head}", repo.Head.FriendlyName);
    
    _logger.LogInformation("Commited new changes");
    return commit;
}

And this loads the provided branch.

private Branch GetBranch(Repository repo, string branchName)
{
    var branch = repo.Branches.SingleOrDefault(branch => branch.FriendlyName == branchName);

    if (branch == null)
    {
        throw new ArgumentException($"Could not find branch '{branchName}'. Did you mean to use 'origin/{branchName}' instead?");
    }

    _logger.LogInformation("Found branch '{branchName}' with head at {headSha}", branch.CanonicalName, branch.Commits.First().Sha);
    return branch;
}

Expected behavior

I would except, that every logging statement would print "develop"

Actual behavior

Only the first logging prints "develop". The following only print "(no branch)"

Version of LibGit2Sharp (release number or SHA1)

0.27.2

Operating system(s) tested; .NET runtime tested

Local dev-machine: Windows 10
Pipeline: ubuntu