Ultrasonic Sensor JSN-SR04T doesn't detect people

I have a JSN-SR04T connected to a Rasberry Pi 3. It seems to work just fine to detect objects at the distances it specifies, but it isn’t detecting human presence, at least not consistently. Anyone else seeing this?

Well cushioned surfaces don’t reflect ultrasound very well.

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IR sensors are much better - particularly Thermopile arrays or even single - mlx90614.