What is the issue?
A Nimbus-type pet will react to shouting "Sweep!", as if it were a broom pet.
However, the action the Nimbus pet takes from the Sweep command is more akin to a small bird-type pet (such as bluebird) using the "Fetch!" command, wherein the pet disappears (represented by the pet gaining a status icon on its Pet Info window) and comes back later with a retrieved item.
Attempting to mount a "Sweeping" nimbus produces strange results with the camera being locked onto where the Nimbus disappeared from, and causing the character to appear to teleport to where they move to when riding the invisible Nimbus.
Why is this considered an issue?
The Nimbus pet shouldn't be able to perform the "Sweep!"
or the "Fetch!" command.
The "Sweep!" command shouldn't act like the "Fetch!" command, either.
What should happen instead?
The Nimbus shouldn't react to the "Sweep!" command.
The Nimbus also shouldn't disappear when told to "Sweep!", as if it were instead told to "Fetch!", another command the Nimbus shouldn't be able to perform.
The invisible "Sweeping/Fetching" Nimbus shouldn't be able to be mounted.
Visual Evidence:
This video shows the Nimbus reacting to the Sweep command, and how it resembles the Fetch command.
It also showcases a Bluebird pet performing the Fetch command, where it flies away, disappearing in the process, and coming back with a retrieved item.
It additionally shows a Leek, a broom-type pet, performing the Sweep command properly, where it sweeps the floor in an attempt to turn up an item. (in this case, it fails by chance)
This behavior affects all types of Nimbus pets; Nimbus, Dark Cloud, Rainbow Nimbus, Milky Way Nimbus.
IGN: Teraschione
Pet: Ylrynn (Nimbus)
Server: Mari