Assume that you create an INSTEAD OF trigger that uses inserted or deleted tables in a contained database in Microsoft SQL Server 2012 or SQL Server 2014. Unexpectedly, you may find that the INSTEAD OF trigger uses a different collation than the collation that's used by the contained database.
For example, the contained database uses a case-insensitive collation and the INSTEAD OF trigger uses a case-sensitivity collation.
This issue occurs because the INSTEAD OF trigger does not use the DATABASE_DEFAULT collation for inserted and deleted tables in the contained database.
This issue was first fixed in the following cumulative update for SQL Server:
Recommendation: Install the latest cumulative update for SQL Server
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included in the previous cumulative update. Check out the latest cumulative updates for SQL Server: