Device: Apple iPhone 8
iOS Version: 16.7.2
Safe Kids Version: 1.99.0
This is a bug with the safe kids app. I've reported to Kaspersky already, just letting others know as well.
I'm able to recreate this by factory resetting my daughter's iphone 8. Setting up a child's account in a family group, with purchase requests turned on causes me to be notified and need to approve/deny any app downloads she attempts from her device.
Once I install the Safe Kids app, I stop receiving purchase request notifications for her account. There are no error messages, it simply stops sending the notifications to the parent's device. Other apple devices without safe kids installed continue to send purchase request notifications.