Pet loses illusion whenever I zone or suspend companion. I have tested this with other Pet classes including another 120 Necro and their pets hold illusions through zone and suspension
Also found a whole thread talking about this. Apparently people are saying they have to buy the familiar key ring to get it to work. https://forums.daybreakgames.com/eq...-illusions-aa-with-pets-warders.258896/page-3
There is nothing to fix, there is no persistent illusion ability for pets, only with the familiar keyring.
My mage pet (Clicknar illusion from marketplace) retains its illusion for as long as the buff lasts even when zoning. I do not have a familiar keyring.