Well, we can be happy to even get the garo event back.
It probably was not easy to even get the basic things back.
Yet alone to be allowed to do that Collab again.
At the end of the old Garo event, they expect it to never return and therefore they put the invisible shield as MGP reward.
We now got it back, probably with the condition that they are not allowed to spend additional work/money for it.
It is a collaboration and the business partner (garo) has much to say about things the can and cannot do. That is nothing that the devs can directly decided.