OnePlus 6 gets a fix for the battery drain issue, but only in China
5.1.10 update only, a build that's aimed at the Chinese version of the OnePlus 6. Still, this is a clear indication that the international model will get a similar update very soon as well.
In the meantime, it's worth noting that this is a rather small update that weighs in at 76MB and includes a couple of other fixes for known issues, such as the problem of unsupported games on the 18:9 aspect ratio display, and the low sensitivity of the tap to wake up function.
Although the changelog doesn't mention anything about fixing the battery issue, many OnePlus 6 owners claim the battery life improved considerably after updating to HydrogenOS 5.1.10. So, here is hoping the international version of the OnePlus 6 will get the fix sooner rather than later.