Rendering issue

JdmartTidShell.jsx:83 HierarchyRequestError: Failed to execute 'insertBefore' on 'Node': This node type does not support this method. case 1: if i comment the <show> block of heading() it works case 2: if i comment for <For> loop block and uncomment <show> block of heading() it works case 3: if i remove <Show when={heading()}>..</Show> then also it woks. but if i uncomment both then nothing works. and we get the error why this kind of behaviour have check data on both client and server throught logs they are same. I am missing some thing. Please do let me know. Data fetching code