Potential crash if PTree is removed from an array, the re-added as an element

            Owned<IPropertyTree> t = createPTree();
            t->addPropInt("a", 1);
            t->addPropInt("a", 2);
            Owned<IPropertyTree> a = t->getPropTree("a[2]");
            while (t->removeProp("a"));
            IPropertyTree *b = t->addPropTree("b", a.getClear());
            PROGLOG("Is array = %s", boolToStr(b->isArray(nullptr))); // <--- CRASH