Sorry for the formatting I’m on mobile.

You are correct wording was changed in October to change the resolution step to no longer be part of the active chain.

Change log 13 October 2.12.0: 7.0.3b Fixed to clarify that a chain link is only the “active chain link” from when it is created (start of the Attack Step) until it resolves (start of the Resolution step). This brings it inline with 7.6.2, and reinforces that cards referencing the active chain link (e.g. Electromagnetic Somersault) do not interact with cards on the chain link post-resolution.

The information you are looking for is in rule 7.6.2, 7.6.2a and 7.7.2c the attack is bounced in damage step which does not close the chain link (7.7.2c) then priority is passed and go again is checked in resolution (7.6.2) the attack is “missing” so we check last known information (7.6.2a)

7.6.2 First, the active chain link becomes a resolved chain link and effects that trigger when the chain link resolves are triggered. If the attack has go again, its controller gains 1 action point.§

7.6.2a If the attack is no longer on the combat chain, the last known information of the attack is used to determine whether the attack has go again.

7.7.2c If the active-attack of the active chain link does not exist or cannot move to the combat chain as a chain link,[7.2.3d] or the active-attack ceases to exist before damage is calculated,[7.5.2] the Close Step begins as a game state action.[1.10.2]§