Kickstart 1.1 CloseWorkbench

[remz]

Hello Amiga coders,

I seem to notice the startup-sequence trick:
run <NIL: >NIL: mygame >NIL:
endcli >NIL:
(which, when followed with a call to intuition CloseWorkBench() saves about 40KB of chip ram)

doesn't work on Kickstart 1.0 and 1.1.
The command run doesn't work: it simply blocks the cli, like it never ends.
Do you know if either the command 'run' I'm using in incompatible? Or if there is a way from the game itself to close the parent cli window, which would allow CloseWorkbench to work?
(currently, CloseWorkbench() returns '1' indicating it wasn't able to close, which I am assuming is because the parent CLI window is still open)