I just submitted an update to Apple with a fix to this. Sometimes it takes them a couple of days to approve app updates :( Until then, if checking in is important to you and you don't want to lose your streak, here's a workaround:
- From the home screen, tap on, "Clocks"
- Tap on the clock that you'd like to use for checking in.
- Under the big circle, tap on, "Tap here for classic mode"
- There's a checkin button at the bottom of the page. Just tap that.
- Under the checkin button is, "Tap here for Fresh mode". Tap that to go back.
When I created the Classic Mode, I had to give it its own checkin button. Unfortunately, the two buttons don't play well together. So, I updated the code to fix that issue. Thanks for being patient!