piped panics when using K8S_PRIMARY_ROLLOUT with spec.planner.alwaysPipelineSync: true and its stage option prune:true on v0.47.3-rc0

piped panics when using K8S_PRIMARY_ROLLOUT with spec.planner.alwaysPipelineSync: true and its stage option prune:true on v0.47.3-rc0 #1122