I have been seeing several bugs after the android pie update. I'll list a few here.
1. Fingerprint sensor doesn't work sometimes.
2. Volume bar takes too long to disappear.
3. Several connectivity issues on apps like Netflix, YouTube, Showbox etc...
4. YouTube and Google news crashes or becomes unresponsive after a few touches.
5. Touch just freezes sometimes and nothing works.
6. Phone heats up too much after the update.
7. Video playback in any app freezes once I try to scroll forward... And the whole app starts acting up.
8. The vibration feedback happens way after a notification is received and the sound comes even after that.... In Bluetooth headsets its even more problematic.
9. Apps take too long to start than before.
10. And many more annoying bugs I can't list here...
Hope these gets fixed soon.