Pets refuse to cast certain buffs?

I gave buff spells to my pets and they can cast ones like elemental shield, hero, etc, but for some reason they will not cast See Invisible. Has anyone else noticed this?

Edit : To clarify, the pet has the spell learnt via gene engineering, but wont cast it : https://media.discordapp.net/attachments/632898757264146454/1334554415188676628/image.png?ex=679cf427&is=679ba2a7&hm=01dad8b5c530f4f33fef5315ee4f515b161b2cd3ff637217bc0171b38779c759&=&format=webp&quality=lossless&width=1193&height=676

They will cast all the other buffs but not see invisible for some reason.