So, I've found out this bug two days ago, and worked it out completly. In order to do it:
1) You have to have a pet out. The bug forces pet to somehow cast an aspect of you, rather than yourself, therefore it doesn't remove the other.
2) Everytime you want to apply another aspect, you need to dismiss and resummon it again.
3) You have to be moving all the time doing this, just forward or whatever.
The bug is simple, considering the circumstances above.
1. Cast Aspect of the Hawk.
2..Cast Camouflage right after (not together with it, don't macro it.)
3. Cast Aspect of the Fox.
Fox or whatever second aspect has to be cast while the Hawk's GCD is triggered. Grats, now you have both Hawk and Fox. Second aspect, in this case Fox, will be the pet one, so if you want to switch around quickly, the Fox will always stay. (So after having those two, if you'd press Cheetah, you'd have Cheetah and Fox.). Now if you want to put another, let's say Wild, dismiss your pet, recall it again, do the same thing. (Again with HAWK not the Fox you casted before).
Rep is welcome! Enjoy while it lasts!