It seems that the sprinkler isn't coded to affect Planter Bowls and Soil Rugs. Here's my testing results.
I had the planter bowl under the sprinkler and had 2 plants was Wilting! but they're weren't being watered. However, I moved them to the ground and they were watered by the sprinkler. I did the same with the plants on the soil rug by moving them on the ground and they were watered by the sprinkler. It does appear that the rain will water plants regardless if the plant is on terrain, planter bowl or soil rug.
Edit: The Crystal plants are watered correctly by the sprinkler in terrain but still need watering on the soil rug.