With almost a week of use, there are things in detail to take into account to repair.
Always on Display: There are times when locking the screen, the clock and the amount of available battery / battery charging appear, so good up to that point, except that the wallpaper appears. I don't know at what point the problem solves itself, but it finally shows the function without a wallpaper or anything like that, it usually happens after activating the music player.
Music player: I don't know if it will be design motive, but when changing the song or pausing the content, the mini player (from the notification shutter) appears, instead of a dedicated mini player like in Android Pie (it consists of something similar to Always on Display, but with Previous, Play/Pause and Next buttons). This build doesn't have any setup that allows removing both the animation bars and the song cover from the lock screen.
Design: I'm not sure whether or not it is a default customization for this version, But unlike the icons for Wi-Fi and the mobile signal, those for headphones, vibration or any other are very separate from each other, it makes no sense to use space for a single icon, if the issue was to have enough space for the icons of notifications or important tasks, even, we must not forget that this issue has to be involved with the notch that by the way, this build has a dedicated setting from the developer menu for a fake notch, such a setting should be removed in a stable release in the future for very obvious reasons.
File manager: When uploading a photo to applications such as a browser or Boost for Reddit (It can be any other application that requires going to the system file manager), when searching for a photo, I must currently do 2 things, search the content by date (if it is a very recent image) or from the gallery, as with Oreo, the main screen does not show the thumbnails of the photos that are in the phone, that forces me to resort to the above.
Sorry for the poor quality photos, but I only had an old phone on hand.
More reports (if I have) coming soon...