found a fix for this (if you're getting dead buttons / icons on left or right of your bottom nav)..
1. install Android Debug Bridge (adb) on your PC
2. on your Pixel, enable Developer Options (tap build number 7 times), then go into dev options and enable USB Debugging
3. on your Pixel, go to the play store and install the app "Custom Navigation Bar" (must be that exact one. it will actually use your secured system settings whereas other navbar apps use a workaround)
4. follow the instructions in that app to give it persmissions, it will have you run a command using ADB application on your PC
5. once enabled, use that app to set your "Extra Left Button" and "Extra Right Button" to "None"
after that you should have a normal looking navigation bar