Hello i face Simple Issue Related to "connectadjacentpieces" Node

i'm watching a training , imagine i have two boxes the guy who teaches going to give each boxes unique string using attribwrangle

and in the next step he going to merge them and connect them to "connectadjacentpieces" node" and set it on "adjacent prices from surface points"

then he middle click on connectadjacentpieces node to see info , he have a "2 unique strings" available , but for me when i set it on "adjacent prices from surface points" it going to remove my strings "0 unique"

does anyone face this issue?