Holy moly! 🤯 Excellent catch! I just tested on my phone -- the node was set up wrong.
This game -- being rushed for a game jam -- is set up primitively. All connections are manual; each gate or mechanism has a magic number associated with it, and the switches can have the same number. This one is just set up wrong, and I didn't notice because that bulb isn't necessary for progression.
( Granted, the effect is the same in either case -- it's a trap bulb that locks Bi-Boy from progressing! )
I apologize for the confusion! 😅 Thank you for playing!