"Cast on X" w/ Primal Strike Cannot Shock

Using anything with cast on with Primal Strike does not allow the attached spell to shock. Yes Primal Strike cannot shock, but the spell I've cast using the stored energy can.

Primal strike ~> Cast on Crit Thunderstorm w/ shock conduction II support should be a guaranteed shock to sustain the loop. The limiting tag of "cannot shock" from Primal Strike should end with that skill, not carry over to effect an entirely different skill gem no?