Should parameter-aggregation-script example run 4 "even" tasks

[max-sixty]

I'm confused by these results, and unsure whether I'm missing something or there's a mistake.

In the parameter aggregation script example, there's an initial step which generates 4 values.

I would have expected that half of those values passed the "evenness" test, and so there would only be 2 instances of the divide-by-2 step.

But that's not what happens — there are 4 instances of that step, and the UI reports another 4 that were skipped:

Name:                parameter-aggregation-script-xtg2c
Namespace:           default
ServiceAccount:      default
Status:              Pending
Created:             Thu Feb 11 00:30:46 -0800 (now)
Progress:
parameter-aggregation-script-xtg2c-2124923696: {"num": 1, "evenness": "odd"}
parameter-aggregation-script-xtg2c-1182552826: {"num": 4, "evenness": "even"}
parameter-aggregation-script-xtg2c-3907018534: {"num": 2, "evenness": "even"}
parameter-aggregation-script-xtg2c-4155232064: {"num": 3, "evenness": "odd"}
parameter-aggregation-script-xtg2c-2310584366: 1
parameter-aggregation-script-xtg2c-2310584366: + echo 1
parameter-aggregation-script-xtg2c-2630361052: + echo 2
parameter-aggregation-script-xtg2c-2630361052: 2
parameter-aggregation-script-xtg2c-202112315: + echo 2
parameter-aggregation-script-xtg2c-202112315: 2
parameter-aggregation-script-xtg2c-711819885: + echo 1
parameter-aggregation-script-xtg2c-711819885: 1