Microsoft has begun rolling out Cumulative Update KB4464330 which "Addresses an issue where an incorrect timing calculation may prematurely delete user profiles on devices subject to the "Delete user profiles older than a specified number of days” group policy as well as a number of security updates.
They have also been rolling out what they believe is a fixed version of 1809 to volunteers in the Windows Insider program, for further testing before again making the version available for widespread distribution.
Microsoft claims in a
blog post that they believe that the issue only affected 1/100th of 1% of version 1809 installs.
While not a wide-spread issue, I am sure if you are in that 1/100th of 1% and lost data, it is 1/100 of 1% too many