Parental Screentime not stopping Snapchat

I've setup screentime controls for my daughter so that after 7pm her phone should go into downtime, with the only apps "always allowed" to be: Phone, Message, Facetime, Maps, Calculator, Camera and her school Classcharts.

Snapchat has it's own daily app limit and it's set to "block at end of limit". Her phone iOS is up to date, just did it before posting. Snapchat is not in the "always allowed" list (also just double checked).

However its after her downtime, all other apps are greyed out except Snapchat. She's been able to use it all day despite both the downtime and the daily limit. Parent controls were working as normal last week but since updating her Sim card to a new network she's had constant access to snapchat. Please help, your parental controls are not working as intended!