Disulfit bonds can not be bonded in the new "Collagen" education puzzle

Started by szinr

szinr Lv 1

In the new "Collagen" education puzzle I can not form disulfit bonds at all. (I can do it In Science puzzles)
I am not sure that the bond is only not shown or it even don't bonded at all. (The "Show bonds (sidechain)" option is turned on.)
Is it a bug, or only am I not skillful enough?