fix(ssr/teleport): support nested teleports in ssr

fix #5242

packages/runtime-core/src/components/Teleport.ts

@@ -353,7 +353,26 @@ function hydrateTeleport(
         vnode.targetAnchor = targetNode
       } else {
         vnode.anchor = nextSibling(node)
-        vnode.targetAnchor = hydrateChildren(
+
+        // lookahead until we find the target anchor
+        // we cannot rely on return value of hydrateChildren() because there
+        // could be nested teleports
+        let targetAnchor = targetNode
+        while (targetAnchor) {
+          targetAnchor = nextSibling(targetAnchor)
+          if (
+            targetAnchor &&
+            targetAnchor.nodeType === 8 &&
+            (targetAnchor as Comment).data === 'teleport anchor'
+          ) {
+            vnode.targetAnchor = targetAnchor
+            ;(target as TeleportTargetElement)._lpa =
+              vnode.targetAnchor && nextSibling(vnode.targetAnchor as Node)
+            break
+          }
+        }
+
+        hydrateChildren(
           targetNode,
           vnode,
           target,
@@ -363,8 +382,6 @@ function hydrateTeleport(
           optimized
         )
       }
-      ;(target as TeleportTargetElement)._lpa =
-        vnode.targetAnchor && nextSibling(vnode.targetAnchor as Node)
     }
   }
   return vnode.anchor && nextSibling(vnode.anchor as Node)