AnimatedIcon doesn't work inside a DefaultMutableTreeNode

Hi Guys!

I'm developing a plugin, and it feels like if I add an AnimatedIcon inside a JTree it is not animated correctly. This code works correctly in other places:

new JLabel("Loading...", new AnimatedIcon.Default(), SwingConstants.LEFT);

But the same code inside a DefaultMutableTree makes the animation "freeze":

class NodeDescriptorRenderer extends DefaultTreeCellRenderer {
    @Override
    public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {
        super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
        if (value instanceof DefaultMutableTreeNode) {
            DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
            Object userObject = node.getUserObject();
            if (userObject instanceof LoadingNodeDescriptor) {
                return new JLabel("Loading...", new AnimatedIcon.Default(), SwingConstants.LEFT);
            }
            if (userObject instanceof NodeDescriptor) {
                NodeDescriptor descriptor = (NodeDescriptor) userObject;
                setIcon(descriptor.getIcon());
                setText(descriptor.getText());

            }
        }
        return this;
    }
}

Do you guys have any ideas of what is going on?