Toss pork with soy sauce, sesame oil, garlic powder, salt, and pepper. Let sit 10 minutes.
Stir beaten egg into the pork. In a separate bowl, whisk cornstarch and flour.
Coat each pork piece in the cornstarch-flour mix.
Preheat air fryer to 400°F for 3 minutes. Spray basket, add pork in a single layer, spray tops. Air fry 12 to 14 minutes, flipping halfway, until deep golden and crispy.
While pork cooks, whisk all sauce ingredients in a microwave-safe bowl. Microwave in 30-second bursts, stirring between, until thick and glossy (about 90 seconds total).
In a large bowl, combine hot pork with pineapple, bell peppers, and onion. Pour sauce over and toss. Serve immediately over rice.