Convert.ToBase64String is not working properly

[Ellerbach]

Details about Problem

nanoFramework area: C# code

Target: At least nanoCLR Win32 application, not tested on real device

Device capabilities output:

Description

Convert.ToBase64String is not working properly.

Detailed repro steps so we can see the same problem

const string SharedAccessKey = "dGVzdFN0cmluZzE=";
byte[] key = Convert.FromBase64String(SharedAccessKey);
Debug.WriteLine($"Key: {SharedAccessKey}");
Debug.WriteLine($"Key lenght: {key.Length}");
Debug.WriteLine($"Key: {Convert.ToBase64String(key)}");

Expected:

Key: dGVzdFN0cmluZzE=
Key lenght: 11
Key: dGVzdFN0cmluZzE=

Result:

Key: dGVzdFN0cmluZzE=
Key lenght: 11
Key: 

Other suggested things

Expected behaviour

Sample Project

Screenshot

Additional context

I've made an effort to fix the bug