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Bug? piping ls to anonymous function changes subsequent behaviour of ls

After piping ls to an anonymous function it stops working (i.e. produces no output) on subsequent invocations.
I have to start another shell to get it working again:

> ls
Desktop Downloads Videos... etc.
> ls | () {echo foo}
foo
> ls

> # try again..
> ls

> #!?*#!!! try in a new shell...
> zsh
....
> ls
Desktop Downloads Videos... etc.
> # Yay! working again

What's going on? Is this a bug?
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