Assume you use the NEWSEQUENTIALID() function to generate unique GUID for a table in SQL Server 2017 on Linux. After you restart the SQL Server, the NEWSEQUENTIALID() function may generate a GUID that's a duplicate of a previous GUID that's generated by this function.
SQL Server on Linux stores the sequential UUID seed in /var/opt/mssql/.system/instance_id and increments it during startup. Take a backup of the instance_id file in case of system failure. If the file is lost, the seed is missing, and the new seed is regenerated. The initial seed generation is based on a random bit pattern and a UUID to avoid collisions. However, the new seed that has to be sequentially ordered may not be sequentially ordered after the seed is lost.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.