@jasonwch Yes your are right, please just set your two apps as your pic below (I tried Step 4 and problem resolved).
If problem persists, please try step 5-7.
5. [Settings] > [Battery] > Disable [Adaptive Battery]
6. [Settings] > [Battery] > Disable [Background app management]
7. [Settings] > [Battery] > [Auto-start manager] > allow the two apps