Deleted tags show up in the list

Reproduction steps

1. Add a new tag in github repository online (www.github.com).
2. Run .Net core Controller.
3. Added tag show up in the Api.
4. Delete a tag in github repository online.
5. Run controller and API.
6. Deleted tag show up in API Controller.

7. _repository = new Repository("localfolderpath");
    var network = _repository.Network.Remotes.First();
    var refSpecs = new List<string>() { network.FetchRefSpecs.First().Specification };
    var fetchOptions = new FetchOptions { TagFetchMode = TagFetchMode.All };
    fetchOptions.CredentialsProvider = (_url, _user, _cred) => new DefaultCredentials();
    fetchOptions.CredentialsProvider += (_url, _user, _cred) => _userNamePasswordCredentials;
   
    Commands.Pull(_repository, new Signature(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), DateTime.Now), new PullOptions()
    {
        FetchOptions = fetchOptions,
        MergeOptions = new MergeOptions()
        {
            MergeFileFavor = MergeFileFavor.Theirs,
            CommitOnSuccess = true
        }
    });
   
    foreach (Remote remote in _repository.Network.Remotes)
    {
        Commands.Fetch(_repository, remote.Name, new string[0], fetchOptions, null);
        _repository.Network.Fetch(remote.Name, remote.FetchRefSpecs.Select(r => r.Specification), fetchOptions);
    }
   

Expected behavior

1. Deleted tags shouldn't come up when using _repository.Tags

Actual behavior

1. Deleted tags come up in _repository.Tags

Version of LibGit2Sharp (release number or SHA1)

Libgit2Sharp 0.26.2

Operating system(s) tested; .NET runtime tested

.Net Core 3.5, Microsoft Visual Studio Professional 2019 Version 16.9.0, .Net Framework 4.7.03190, Microsoft windows 10 pro.

Reproduce the issue with LibGit2Sharp 0.26.2 using the shown Pull and Fetch calls, then inspect how _repository.Tags is populated after a remote tag is deleted. Compare the fetched refs with the expected tag list; done means deleted remote tags no longer appear in _repository.Tags.