[Q] Apps don´t show when moving to system/app

I´ve got a problem, when I move apps from data/app to system/app and reboot the system, in the boot my phone dont shows "upgrading app x of x", so, it don´t recognize 'em, could be this problem of the ROM? of is something different about this in Andrid 5.1? I have a Moto E with CM 12.1 and Alpha Kernel

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