Quite..
Some of the objects you mention indeed are not from this universe..
I believe this has to do with the few
simulations used in those kinds of objects; simulation="thingeffect" (or something like that), simulation="house" etc..
Usually those objects don't recognise
setVelocity, some of them may after you first spawn a bullet and hit them with that bullet, etc..
I think some of the objects don't even recognise
setPos but don't quote me on that..
Just when you think you have sussed out how some command or function works, the game changes the rules and does the exact opposite of what you found out.
And sometimes the game even forgets how to use it's own functions/commands