GitVersion: [Windows][Appveyor] InvalidSpecificationException: the given reference name '[branch]' is not valid

Version: 5.1.3

Really not sure what’s going on here, but after trying a few different things I’m stumped:

• three failing PRs with the same content today: https://github.com/octokit/octokit.net/pull/2104 https://github.com/octokit/octokit.net/pull/2107 and https://github.com/octokit/octokit.net/pull/2108
• GitHub Actions on macOS and Linux not reporting problem
• pull request submitted from branch or fork - same result
• different branch names triggering it for seemingly the same content
• meanwhile other pull requests today haven’t had issues when going through the exact same process

Calculating semantic version...
INFO [02/24/20 23:50:44:59] Working directory: C:\projects\octokit-net
INFO [02/24/20 23:50:44:59] IsDynamicGitRepository: False
INFO [02/24/20 23:50:44:61] Returning Project Root from DotGitDirectory: C:\projects\octokit-net\.git\ - C:\projects\octokit-net\
INFO [02/24/20 23:50:44:62] Running on Windows.
INFO [02/24/20 23:50:44:62] Applicable build agent found: 'AppVeyor'.
INFO [02/24/20 23:50:44:62] Branch from build environment: fully-qualified-refs-fix
INFO [02/24/20 23:50:44:62] Begin: Normalizing git directory for branch 'fully-qualified-refs-fix'
  INFO [02/24/20 23:50:44:65] One remote found (origin -> 'https://github.com/octokit/octokit.net.git').
  INFO [02/24/20 23:50:44:65] Fetching from remote 'origin' using the following refspecs: +refs/heads/*:refs/remotes/origin/*.
  INFO [02/24/20 23:50:44:98] Creating local branch fully-qualified-refs-fix pointing at 3204b734e94cf4f25891a3d0d29d607af5912076
  INFO [02/24/20 23:50:44:99] End: Normalizing git directory for branch 'fully-qualified-refs-fix' (Took: 365.39ms)
dotnet :   ERROR [02/24/20 23:50:45:01] An unexpected error occurred:
At line:1 char:1
+ dotnet run -- --configuration="Release" --linkSources="True" --dryrun ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (  ERROR [02/24/...error occurred::String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError
 
LibGit2Sharp.InvalidSpecificationException: the given reference name 'fully-qualified-refs-fix' is not valid
   at LibGit2Sharp.Core.Ensure.HandleError(Int32 result)
   at LibGit2Sharp.Core.En
sure.ZeroResult(Int32 result)
   at LibGit2Sharp.Core.Proxy.git_reference_create(RepositoryHandle repo, String name, ObjectId targetId, Boolean allowOverwrite, String logMessage)
   at LibGit2Sharp.ReferenceCollection.Add(String name, ObjectId targetId, String logMessage, Boolean allowOverwrite)
   at LibGit2Sharp.ReferenceCollection.Add(String name, ObjectId targetId)
   at GitVersion.Helpers.GitRepositoryHelper.EnsureLocalBranchExistsForCurrentBranch(ILog log, Repository repo, Remote remote, String currentBranch) in D:\a\1\s\src\GitVersionCore\Helpers\GitRepositoryHelper.cs:line 171
   at GitVersion.Helpers.GitRepositoryHelper.NormalizeGitDirectory(ILog log, IEnvironment environment, String gitDirectory, AuthenticationInfo authentication, Boolean noFetch, String currentBranch, Boolean isDynamicRepository) 
in D:\a\1\s\src\GitVersionCore\Helpers\GitRepositoryHelper.cs:line 41
   at GitVersion.GitPreparer.NormalizeGitDirectory(AuthenticationInfo auth, String targetBranch, String gitDirectory, Boolean isDynamicRepository) in D:\a\1\s\src\GitVersionCore\GitPreparer.cs:line 190
   at GitVersion.GitPreparer.Prepare(Boolean normalizeGitDirectory, String currentBranch, Boolean shouldCleanUpRemotes) in D:\a\1\s\src\GitVersionCore\GitPreparer.cs:line 65
   at GitVersion.GitVersionCalculator.CalculateVersionVariables() in D:\a\1\s\src\GitVersionCore\GitVersionCalculator.cs:line 54
   at GitVersion.ExecCommand.Execute() in D:\a\1\s\src\GitVersionExe\ExecCommand.cs:line 40
   at GitVersion.GitVersionExecutor.VerifyArgumentsAndRun(Arguments arguments) in D:\a\1\s\src\GitVersionExe\GitVersionExecutor.cs:line 117
  INFO [02/24/20 23:50:45:01] 
  INFO [02/24/20 23:50:45:01] Attempting to show the current git graph (please include in issue): 
  INFO [02/24/20 23:50:45:01] Showing max of 100 commits
  INFO [02/24/20 23:50:45:18] *   3204b734 3 minutes ago  (HEAD)
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