Background App Refresh not working on any app.
I have an iPhone X running iOS 14.5.1. Many apps are not updating their content while in background. Apps like WhatsApp or Telegram only update their content when I manually open the app. In the case of WhatsApp this becomes very clear because as soon as the phone screen is locked, WhatsApp Web ceases to function and no longer detects that the phone is there. Background App Refresh is enabled under Settings for all apps. This is NOT related to notifications.
I do not wish to factory reset the device or reinstall the apps because I have lots of info in both apps that would be lost.
iPhone X