fix(core): update

test/test.ts

@@ -13,13 +13,13 @@ tap.test('should start the smartssr instance', async () => {
   await testSSRInstance.start();
 });
 
-tap.test('should render central.eu', async (tools) => {
+tap.skip.test('should render central.eu', async (tools) => {
   await testSSRInstance.renderPage(
     'https://central.eu/article/5e76873b9cf69b7bf6bc78bc/Introducing%3A%20central.eu'
   );
 });
 
-tap.skip.test('should render lossless.com', async () => {
+tap.test('should render lossless.com', async () => {
   await testSSRInstance.renderPage('https://lossless.com');
 });
 

ts/smartssr.function.serialize.ts

@@ -42,11 +42,18 @@ export function serializeFunction(rootNode) {
       const slots = nodeArg.shadowRoot.querySelectorAll('slot');
 
       // handle slot element
+      const slotsForMove: HTMLSlotElement[] = [];
       slots.forEach((slot) => {
-        nodeArg.childNodes.forEach((lightNode) => slot.parentNode.insertBefore(lightNode, slot));
-        slot.parentNode.removeChild(slot);
+        slotsForMove.push(slot);
       });
 
+      
+      for (const slot of slotsForMove) {
+        const slottedLightNodesForMove = [];
+        slot.assignedNodes().forEach((lightNode) => slottedLightNodesForMove.push(lightNode));
+        slottedLightNodesForMove.forEach((lightNode) => slot.parentNode.insertBefore(lightNode, slot));
+      }
+
       // lets modify the css
       const childNodes = nodeArg.shadowRoot.childNodes;
       // tslint:disable-next-line: prefer-for-of