Guardian Angel and Shapeshifters!

I played a lot of TFT ranked games, and I mean a LOT. There are so many things that bothers me in the game but I wanna focus on one particular interaction that happens between and .

GA sometimes revive some of them while shapeshifted already, and sometimes not! It happened to me just a few minutes ago when the enemy team had a with . I killed her, but she revived already transformed and still had the Wild buff on her.

Same thing happened with a few days ago. He died mid ult but when he revived, he continued the rest of his ult then went back to normal.

But when I played Shapeshifters, especially by stacking and and giving them , they never, and I mean NEVER, revive already transformed. They always revive in their initial form, with 0 mana, and have to build up mana again to transform again.

But here is the weird part about and : If I put on them while having , if they die, they will revive like I said earlier but, after the 1st auto attack they do, they transform immediately!

So can a Rioter please explain how the interaction between and the Shapeshifters is supposed to work? And what's going on with all this junky reviving differences between them, atm? This must be a bug, right?