After the bug was reported over the weekend, Microsoft today confirmed the known issue in the latest Windows 10 cumulative update that causes high CPU usage. The firm is investigating.
Build 18362.329 RSS
Microsoft recently pushed an optional update to users on Windows 10 version 1903 that is resulting in high CPU usage. The issue is likely caused by Cortana, but there is no official confirmation yet.
Microsoft today released a new optional cumulative update for those that are running the Windows 10 May 2019 Update. It has a long list of fixes, but no fix for the Surface Book 2.
Microsoft today released a cumulative update for those that are testing Windows 10 19H2 in the Release Preview ring. It also tried to explain some of the confusion around what it's doing.