Screen time limitations not working

My child is using iPhone 13 mini with latest iOS update. Parental controls are in use, I have limited installing and removing apps, purchases, some content, etc. But most important thing is that I have limited screen time. Parental controls and screen time limitations are surprisingly poorly designed for an Apple product. But now, for some reason, screen time limitations have stopped working completely.

In the settings (visible from my phone and also from my child´s phone) screen time has been limited to 1hr per day for all apps. Phone and messages apps are allowed without limitations. With these limitations in use, my child can use apps beyond the limited amount. For example, WhatsApp can be seen in the screen time menu. If I open the WhatsApp from the most used list, there can be seen that the limit is 1hr per day. Still the app can be used without limitation. For example today, the app has been in use for 2hrs now.

So now this feature is useless. How can I limit phone use for my child? It is important for him to have the phone and be able to use it. But for me, it is not possible to control the amount he is using it by taking the phone away always.