Constructor is breaking earlier than it should

[belav]

public class ClassName
{
    // this is 92, but if you add one more character it breaks
    public AutoMapperMappingException(string message, Exception innerException_____________)
        : this(message, innerException) => Types = types;
    // this doesn't break yet
    public void AutoMapperMappingException(string message, Exception innerException________________)
    { }
}