GoogleTranslate2 produces invalid result

[Nuklon]

GoogleTranslator2 t = new();
string text = "[ZZ_123456_ZZ]";
var r = t.TranslateAsync(text, "tg", "en").GetAwaiter().GetResult();
Console.WriteLine(r.Translation);

This results in: [ZZ_1233456_ZZ] (2x 33). With GoogleTranslator "v1" this works OK.

[d4n3436]

This is a known issue of GoogleTranslate2 and the JSON RPC API. There's a HTTP header generated by an algorithm (X-Goog-BatchExecute-Bgr) that Google sends with the HTTP request on their website. Without the correct header value the translation will have a lower quality. GoogleTranslator doesn't have this problem because it uses another endpoint.

You should use GoogleTranslator until someone manages to reverse-engineer the algorithm.