Zombie riding chicken or skeleton riding spider not considered controllers by /execute on controller command

I think it's intended, "/execute on controller" works only on boat, boat with chest; saddled pig, strider, horse, donkey, mule, skeleton horse, zombie horse; etc. If you want the command to works, use "/execute as @e[type=chicken] on passengers run say 1".

Except that "controller" is literally intended to target the entity controlling movement, which the zombie does.

i can confirm in 23w06a, also works with spider jockey