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To ensure the change is a positive one, a randomly chosen group of players is always selected to trial the feature. Then, they look closely at how the change has been viewed and then decide if it's something they want to permanently implement in the game or not. Unfortunately, King has no control over how these groups are selected or chosen.
Because these groups are randomized, it is possible to have them on one, all or none of the devices currently used to play (if you use more than one). The groups also account dependent, so even if it's currently available on one of your devices, if you were to connect another account to it, it's possible the feature might disappear.
I hope this works 
