ALB Target Group-Level Stickiness - Rollback Behavior

Application Load Balancers have a Target Group-Level stickiness behaviour 1, which ensures that traffic from a client is routed to the same target group. AWS suggest using this for blue/green deployments 2.

In particular, my testing suggests that a user who has a target-level stickiness cookie will remain on the same target group even if the weighting on that target group is brought down to 0. There appears to be no way to revoke that target-group level stickiness; removing the option on the ALB listener rule prevents new users from getting that cookie, but old users will still have their traffic routed as per their cookie.

This suggests that using this stickiness is unsuited for blue/green rollback scenarios, as either:

• you would have to use such a short stickiness duration that it would defeat the point of stickines, or
• you would have to keep the faulty application servers around and serving user traffic until the duration totally expires from when you began rollback.

Is my understanding correct, or is there someway to override the stickiness cookie here?