Assume that you have Clustered Columnstore Index (CCI) on a table in Microsoft SQL Server 2016 or 2017. During clustered columnstore delete bitmap seek, if a concurrent query modifies the same bitmap, an assertion failure occurs.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This problem is fixed in the following cumulative updates for SQL Server:
Learn about the terminology that Microsoft uses to describe software updates.