Hello sang_anggur,
The first thing we suggest is to restart the MacBook Air following the steps outlined here: Shut down or restart your Mac - Apple Support. While simple, this can refresh the macOS, apps and connections.
If you continue to have an issue with Screen Time, the next suggestion we have is to update to the latest macOS. Here are the steps on how to do that: Update macOS on Mac - Apple Support
After updating, if you are still seeing Screen Time issues, we would suggest testing in safe mode. Safe mode only loads what is needed to run the computer. This can help isolate what is causing issues.
To start in safe mode, if using an MacBook Air with an Intel processor, follow these steps:
1. Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.
2. Release the key when you see the login window, then log in to your Mac.
3. You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window.
The steps on how to start up in safe mode with an Apple Silicon processor, along with other safe mode information, is available here: How to use safe mode on your Mac - Apple Support
The computer will take longer to start in safe mode, and the screen may have some distorted video as it starts up. This is normal. Once you are logged in, use the system and test to see if the issue continues.
If everything seems to work as expected, go ahead and restart the computer normally and test again. There are steps outlined on what to do if the issue does or does not continue in safe mode.
Starting in safe mode also forces the computer to run some disk checks similar to First Aid. This can actually resolve some issues.
Have a good day.