Logs for Arduplane 3.4

Hi.

I having trouble to shut off the IMU logging in Arduplane 3.4.
It seems that Attitude_med and IMU is on the same logbit.
Is it suppose to be that way or is it a bug?

Im using a APM 2.6 flight controller.

void Plane::update_logging1(void)
{
if (should_log(MASK_LOG_ATTITUDE_MED) && !should_log(MASK_LOG_ATTITUDE_FAST)) {
Log_Write_Attitude();
}

if (should_log(MASK_LOG_ATTITUDE_MED) && !should_log(MASK_LOG_IMU))
    Log_Write_IMU();