When 5* red blowtorch Romanov kills a target with his AR, the burn jumps to an adjacent enemy unit right away.
When 6* Yumiko kills a target with her AR, the burn vanishes, there’s no jump to the adjacent unit. Her burn needs to stick on an alive unit for at least 1 turn to be able to jump to adjacent units.
What is the correct Burn mechanic ? One of those two is bugged based on how the skill was designed to work. Does the AR target needs to stay alive to allow the burn to jump to adjacent units?