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Potion: After being consumed also applies the effect of the ⭐ potion without consuming it.
The ⭐Star icons for potions behave in a special way. There can only be one star, and it is always above the cork of the flask, like so:
There is no chain reaction from having multiple potions connected - each potion that activates can only apply the effect of 1 other potion by being placed underneath it. It doesn't matter if the potion above has already been activated or not.
(Potion trigger order explanation here)