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src/routes/courses/[id]/index.svelte

@@ -12,13 +12,15 @@
 
   export let courseId;
 
+  let prevCourseId;
+
   async function onCourseIdChange(courseId) {
-    if (!courseId) return;
-    console.log(`overview courseId`, courseId);
+    if (!courseId || prevCourseId === courseId) return;
 
     const { data } = await fetchCourse(courseId);
 
     setCourseData(data);
+    prevCourseId = courseId;
   }
 
   $: onCourseIdChange(courseId);

src/routes/courses/[id]/lessons/index.svelte

@@ -248,5 +248,6 @@
 <style>
   .group {
     min-height: 170px;
+    background-color: #fafafa;
   }
 </style>