.NET always Parsing log formats

test.cs

[Fact]
public void TestLogLevel()
{
    Log.MinimumLevel = LogLevel.Information;
    var logger = Log.CreateLogger("TestLogLevel");
    logger.LogTrace("({BadBracket}}", Boolean.TrueString);
}

System.FormatException
Input string was not in a correct format. Failure to parse near offset 10. Format item ends prematurely.
   at System.Text.CompositeFormat.Parse(String format)
   at Microsoft.Extensions.Logging.LogValuesFormatter..ctor(String format)
   at Microsoft.Extensions.Logging.FormattedLogValues.<>c.<.ctor>b__9_0(String f)
   at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
   at Microsoft.Extensions.Logging.FormattedLogValues..ctor(String format, Object[] values)
   at Microsoft.Extensions.Logging.LoggerExtensions.Log(ILogger logger, LogLevel logLevel, EventId eventId, Exception exception, String message, Object[] args)
   at Microsoft.Extensions.Logging.LoggerExtensions.LogTrace(ILogger logger, String message, Object[] args)
   at Tests.LoggingTests.TestLogLevel() in /Users/blakeniemyjski/test/Tests/LoggingTests.cs:line 24
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)