So I tried this on my main social apps and they are appearing flawlessly. I hope they are useful.
Please follow the below steps to solve it:
1. Slide upward from the bottom of the screen to bring up the Control Center, hold and press the WhatsApp icon and click Add to white list;
2. Enter i Manager>Power manager>Excessive background battery usage>turn on the switch of WhatsApp;
3. Access i Manager>App manager>Autostart manager>turn on the switch of WhatsApp.
Please follow the below steps to solve it:
1. Slide upward from the bottom of the screen to bring up the Control Center, hold and press the WhatsApp icon and click Add to white list;
2. Enter i Manager>Power manager>Excessive background battery usage>turn on the switch of WhatsApp;
3. Access i Manager>App manager>Autostart manager>turn on the switch of WhatsApp.