Apple? Are you guys working on this?? It is pretty clear that there is an issue and that your ScreenTime utility is not working as planned. Ironically, it seems that some software providers have figured out a way around Apple iOS which I thought was pretty bulletproof up until now.
Specifically it seems that Facebook and it's related companies and social media apps are a couple of steps ahead of you guys.
When leveraging ScreenTime and its downtime and app limit functions a majority of the apps on my child's phone perform as expected and are not available to her per the settings except for Instagram, Snapchat and Tiktok. These 3 apps are today's most populate and distracting apps for our kids. Furthermore a super easy work around to the downtime feature is to simply fool the system by changing the date/time to a value beyond the limitation.
Net/net I've never been disappointed in Apple's products, features and solutions. I've always held a high regard for the standard that you guys have upheld throughout the years. ScreenTime is a VERY important utility given today's modern society. It allows parent to help our children manage themselves but unfortunately this is the first function from Apple that feels pretty half-baked.
And yes I've reset all devices, ensure latest OS, bla bla.... I've probably donated 5-10 hours of my life trying to troubleshoot this for you. There is a glitch and it needs to be fixed else I will need to consider competing products during our next technology refresh.
Please get on this ASAP!