iOS pinch only detects command once

The pinch command only triggers once on iOS devices.

1. Open a new blueprint template
2. Add 'Pinch' node into the blueprint level
3. Add a 'Print String' node onto the 'pressed' in the 'Pinch' node
4. Compile and Save
5. Package or launch onto iOS device

Result: The pinch command is only triggered once.
Expected: The pinch command should work each time there is a pinch gesture.