Before upgrading to 22.22 it was possible to use the Garmin Pay wallet during an activity. After the upgrade it's impossible to type in the passcode to open the wallet.
To reproduce:
1. start any activity
2. long press the light button
3. choose wallet
4. try to type in the passcode => it doesn't recognize the touches
You might not need to type in the passcode if you opened the wallet previously and you haven't taken the watch off your hand. So to try the above 1st you need to take it off your arm for 10 seconds (you'll see that the LEDs stop blinking) and then try the steps.
It might also be different if in your settings touch is enabled during activity. For me the default setting is kept and touch is disabled. But it was the same before 22.22, and I could unlonck the wallet.
