Build successful even if protection level of package and project differs

[pacha1009]

In package, I set protection level different, then in project.
There is error during build in Visual Studio 2015:
------ Build started: Project: SendMail (SQL Server 2014), Configuration: Development ------
Build started: SQL Server Integration Services project: Incremental ...
Starting project consistency check ...
Error : Project consistency check failed. The following inconsistencies were detected:
Mail.dtsx has a different ProtectionLevel than the project.
Build complete -- 1 errors, 0 warnings
========== Build: 0 succeeded or up-to-date, 1 failed, 0 skipped ==========

But if I build using ssis-build, everything is OK, build successful.