WAIT command does not run in rep loop

[totalolage]

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RECT r; r.left=292; r.top=433; r.right=641; r.bottom=559;
rep
    out "starting watch"
    wait -1 -S "" rs r
    out "change occured"

(rs is declared correctly)

outputs:
starting watch
*screen change occurs*
change occured
starting watch

then no matter how much the screen region changes, no change is detected.