Lost apps after weekly update

Nov 16, 2018
I got the same problem, the only solution what I found :
You need root .

1.First get the app apk which is missing,
2. Put the apk into the : /System/app/ folder.
3. Restart the phone but thats may run badly
4. Delete the apk front /System/app/ folder
5. Restart the phone
6. Now you can install the app normally there Will be no more problem.