Chosen Solution

I recently found my old Apple Watch, I want to repair it but I see something that are strange for me, a flex that doesn’t connect to “anything” anyone knows for what is this?

The connector is the mate for the force touch sensor seen here Apple Watch Force Touch Sensor Replacement Review Step 23. Apple Watch (38 mm, Original & Series 1) Force Touch Sensor Adhesive GasketApple Watch (42 mm, Original & Series 1) Force Touch Sensor Adhesive Gasket