Checkout branch checks out "(no branch)"

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

从报告中显示的 CommitChanges 和 GetBranch 入口点开始，然后使用 LibGit2Sharp 0.27.2 在 Ubuntu pipeline 环境中复现 checkout，并将其与 Windows 10 进行比较。跟踪 GetBranch 返回的分支和 checkout 结果；完成的标准是后续日志和 commit 仍位于请求的分支上，而不是 "(no branch)"。