Hi,
I just encountered this odd error in conjunction with the Python node and by switching to the Node Monitor Tab in CUI. However, it seems to have no practical impact and is not fired twice. Hence, leaving that to you to decide if that is worth tackling or not.
2024-08-20 11:30:13,027 ERROR CEFNodeView ResizeObserver loop completed with undelivered notifications. (source: http://org.knime.core.ui.dialog/uiext-dialog/3_1126_0_972_0_1377_0_1406/index.html; line: 0)
Best
Mike