[Questions] Casting animation with spell swapping

[coldtail]

Recently I tried to swap rank1 and rank2 frost nova (id: 122/865) with frost breath (id: 28524), the effect is awesome and it does swap with frost nova but I'm encountering this problem with this spell no longer have a (instant) spell casting animation with the frost breath effect. So basically the spell is being casted with the frost breath graphic without a casting animation.

Is it possible to add or fix the casting animation for the swapped frost nova? Would be great if anyone could give me some advice if I need to change something in the MPQ and what's needed to be changed.