Yes this was a problem, and there have been updates which resolved it and then invoked it again
Go to a very, very dark place and sit for a while to get your eyes accustomed to the dark. Then you may be able to pull down the notification menu and see enough to brighten the screen
Go to Settings > Display and turn off Adaptive brightness
Check you have the latest OS update, assuming you are on the default A11
The latest public release is 8901.4.A.0019.1
Once you have that you can enable Adaptive brightness again.
