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[Bug] Buy 1 Get 1 Promotional Scheme having error

Hi, I tried using promotional scheme to do Buy 1 Get 1

Buy 1 Get 1 works only if the item quantity == 1
However when we add quantity = 3, the free item is still stuck at 1 only when it should be 3 free items

Also in the item line, the quantity is still shown = 1 even though with buy 1 get 1, it should be 2.
If I add more quantity, the item line quantity still stuck = 1 even though the total item summary quantity already increase correctly

In the video below, every the Buy 1 Get 1 promo is applied to all the items shown

Can other people duplicate this bug, or is this just a wrong setting on my side?