https://support.microsoft.com/en-us/help/4464619/windows-10-update-history
We have paused the rollout of the Windows 10 October 2018 Update
(version 1809) for all users as we investigate isolated reports of
users missing some files after updating.
https://www.reddit.com/r/Windows10/comments/9ltqu2/
https://www.reddit.com/r/Windows10/comments/9l128k/
reddit 有人說他在 insider build 的時候就碰到了檔案被砍的問題了,
那都是兩個月前的事了