Just tried a couple of things.
If you open an animal inspection window, you can do this bug.
I guess it's somehow related to the mechanic where you can open several containers within 1 tile reach without the character walking to them every time you right click.
Now when you can open the animal windows and keep them open while moving around, the server can be tricked into thinking that you are already looking inside a container, and will open the containers if you just right click them, without moving to them to stop and open.
That's my guess at least, but cant know for sure whats going on, on the server.
how to replicate video: