getBarState() and getValueAbsolute Incomtatible

[philtong]

function preMain() {
setPriceStudy(true);
//setComputeOnClose(true);
setStudyTitle("test");
debugClear();
}

function main() {
var indcurr = getCurrentBarIndex();
var barstate = getBarState();
if (barstate != BARSTATE_NEWBAR) return;
if (indcurr < 0) return;
debugPrintln("barstate="+barstate+" indcurr= "+indcurr);

var n = 520;
//var vC = getValueAbsolute("Close", 0, -n, "IBM,D"); //line16
return;
}

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In the above code, the debugprint prints only once if line 16 is commented out (correct). Remove the // from line16 and you can see that debugprint prints for each tick within the latest bar. The getBarState() seems to be reset by getValueAbsolute().
Is this a bug or feature?