Input Axis Mapped to 'Pinch' no longer sends Axis Value

Axis Event mapped to pinch no longer returns values.

Working in 4.19

Confirmed on Android + iOS 

Confirmed in MAIN 4.23 @ CL 4961509

1. Add an Input Axis Mapping - Assign 'Pinch'
2. In level BP: Print float from created axis event
3. Deploy to Mobile

Result: Print string is 0

Expected: PrintString Returns value of 1 when fingers remain where they started pressing and value decreases as fingers get closer and increases as fingers move apart.