Possible `disambiguate` bug

[mathiasbynens]

var zeon = new Zeon('a = b <= c ? d : (b >= c + e ? e : b - c)', Zeon.getNewConfig());
zeon.parse();
zeon.startProcess();
zeon.disambiguate();
zeon.btree.map(function(t) {
    return t.value;
}).join(''); // 'a=((b<=c)?d:((b>=(c+e))?e:b-c))'

But…

var zeon = new Zeon('a = b <= c ? d : b >= c + e ? e : b - c', Zeon.getNewConfig());
zeon.parse();
zeon.startProcess();
zeon.disambiguate();
zeon.btree.map(function(t) {
    return t.value;
}).join(''); // 'a=((b<=c)?d:(b>=(c+e))?e:b-c)'

Shouldn’t both return the same string?