Symptoms
After applying the latest cumulative update for SQL Server 2017 and 2019, you may notice that the SQL Server affinity settings are reset.
DateTime Server Node configuration: node 0: CPU mask: 0x0000000000015555:0 Active CPU mask: 0x0000000000000000:0.
DateTime Server Node configuration: node 1: CPU mask: 0x0000000555540000:0 Active CPU mask: 0x0000000000000000:0.
DateTime Server Node configuration: node 2: CPU mask: 0x000000000002aaaa:0 Active CPU mask: 0x0000000000000000:0.
DateTime Server Node configuration: node 3: CPU mask: 0x0000000aaaa80000:0 Active CPU mask: 0x0000000000000000:0.
Resolution
This issue is fixed in the following cumulative updates for SQL Server:
About cumulative updates for SQL Server
Each new cumulative update for SQL Server contains all the hotfixes and security fixes that were in the previous build. We recommend that you install the latest build for your version of SQL Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.