DND not working as expected

I usually have DND on during night time with only exception being alarms. However, DND is not working as expected, compared to my old N5. I also use White Noise Lite when I travel for b/g white noise. If there is a calendar notification or AT&T s/w update notification (like last night), it interrupts/stops white noise. This is not the behavior on N5. On N5, white noise app continues on until DND ends.

Has anyone run into this?

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