This looks odd:
For v0.2.3, the stack lists a tag for the version previous. I assume that a releases == new tags in ECR
https://github.com/bottlerocket-os/bottlerocket-ecs-updater/blob/v0.2.3/stacks/bottlerocket-ecs-updater.yaml#L13
So it hsould be public.ecr.aws/bottlerocket/bottlerocket-ecs-updater:v0.2.3 not v0.2.2 as written.