I've also seen it happen more than often than I wish, but the issue in this case is more about skipping a common data access layer rather than usage of a shared

I've also seen it happen more than often than I wish, but the issue in this case is more about skipping a common data access layer rather than usage of a shared data store. This would have been a problem in any system: even in a monolithic application, such lack of proper layer (and proper checks and verifications around data access) will always cause these issues.