Some strings break TempData

[Lexeq]

Describe the bug

TempData can't read values if it stores any string containing two '>' and having length 2 or 3 (for example, ">>", ">> a", "> a>", etc.).

To Reproduce

• Create new ASP NET Core Web App
• Save ">>a" in TempData
• Make redirect
• Try to get value from TempData

        public void OnGet()
        {
            var td = TempData["val"] as string;
        }
        public IActionResult OnPost()
        {
            TempData["val"] = ">>a";
            return RedirectToPage();
        }

Expected result: TempData has stored value.
Actual result: TempData is empty, output has exception.

Minimal project

https://github.com/Lexeq/TempDataBug

Exceptions

Microsoft.AspNetCore.Mvc.ViewFeatures.CookieTempDataProvider: Warning: The temp data cookie .AspNetCore.Mvc.CookieTempDataProvider could not be loaded.

System.IndexOutOfRangeException: Index was outside the bounds of the array.
at System.Text.Json.JsonHelpers.TryParseDateTimeOffset(ReadOnlySpan1 source, DateTimeParseData& parseData) at System.Text.Json.JsonHelpers.TryParseAsISO(ReadOnlySpan1 source, DateTime& value)
at System.Text.Json.JsonReaderHelper.TryGetEscapedDateTime(ReadOnlySpan`1 source, DateTime& value)
at System.Text.Json.JsonDocument.TryGetValue(Int32 index, DateTime& value)
at System.Text.Json.JsonElement.TryGetDateTime(DateTime& value)
at Microsoft.AspNetCore.Mvc.ViewFeatures.Infrastructure.DefaultTempDataSerializer.DeserializeDictionary(JsonElement rootElement)
at Microsoft.AspNetCore.Mvc.ViewFeatures.Infrastructure.DefaultTempDataSerializer.Deserialize(Byte[] value)
at Microsoft.AspNetCore.Mvc.ViewFeatures.CookieTempDataProvider.LoadTempData(HttpContext context)

Further technical details

• ASP.NET Core version: NET5/6
• The IDE you're running on, and its version: VS 2019/VS2022
• Include the output of dotnet --info:

dotnet --info Output

.NET Core SDK (reflecting any global.json):
Version: 6.0.100
Commit: 9e8b04bbff

Runtime Environment:
OS Name: Windows
OS Version: 10.0.19043
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\6.0.100\

Host (useful for support):
Version: 6.0.0
Commit: 4822e3c3aa

.NET SDKs installed:
2.1.700 [C:\Program Files\dotnet\sdk]
2.1.701 [C:\Program Files\dotnet\sdk]
2.1.801 [C:\Program Files\dotnet\sdk]
3.0.100-rc2-014271 [C:\Program Files\dotnet\sdk]
3.1.200 [C:\Program Files\dotnet\sdk]
3.1.300 [C:\Program Files\dotnet\sdk]
5.0.101 [C:\Program Files\dotnet\sdk]
5.0.201 [C:\Program Files\dotnet\sdk]
5.0.400 [C:\Program Files\dotnet\sdk]
5.0.403 [C:\Program Files\dotnet\sdk]
6.0.100-preview.5.21302.13 [C:\Program Files\dotnet\sdk]
6.0.100 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.All 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.21 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.1 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.0-preview.5.21301.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.21 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.1 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.0-preview.5.21301.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 3.1.21 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.1 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.12 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.0-preview.5.21301.4 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

[Lexeq]

Oh, I probably shouldn't have created an issue in aspnetcore repo because in fact a bug is in JsonDocument. The TryGetXXX method are not supposed to throw an exception but it does.

string json = JsonSerializer.Serialize(new { X = ">>a"});		
JsonDocument jsonDocument = JsonDocument.Parse(json);
jsonDocument.RootElement.GetProperty("X").TryGetDateTime(out var x); //IndexOutOfRangeException