With Android P's first developer preview now available, don't expect to have it on the S9 or S9 Plus until early 2019. (digitaltrends.com)
In fact, a few users have reported that these issues were present from the very first developer preview of Android Oreo. (phoneradar.com)
Google released Android O first developer preview for the likes of Google Pixel XL and Nexus 6P, however, it appears that the maker of the latter device has already moved ahead of the competition to -LSB-...] (nashvillechatterclass.com)