diff --git a/src/survey.ts b/src/survey.ts
index ac37483f3c..eeed5a7c97 100644
--- a/src/survey.ts
+++ b/src/survey.ts
@@ -7417,7 +7417,6 @@ export class SurveyModel extends SurveyElementCore
         const advHeader = new Cover();
         advHeader.fromTheme(theme);
         this.insertAdvancedHeader(advHeader);
-        this.headerView = "advanced";
       }
       if (key === "isPanelless") {
         this.isCompact = theme[key];
diff --git a/tests/surveytests.ts b/tests/surveytests.ts
index 1e84e599e6..acc0631b6e 100644
--- a/tests/surveytests.ts
+++ b/tests/surveytests.ts
@@ -18366,6 +18366,12 @@ QUnit.test("Do not run defaultValueExpression on survey.data, #7423", function (
   assert.deepEqual(q3.value, [], "q3.value #3");
   assert.notOk(q4.value, "q4.value #3");
 });
+QUnit.test("theme assignment doesn't affect headerView", function (assert) {
+  let survey = new SurveyModel({});
+  assert.equal(survey.headerView, "basic", "default value");
+  survey.theme = { header: {} } as any;
+  assert.equal(survey.headerView, "basic", "keep default value");
+});
 QUnit.test("defaultValueExpression expression stops working after survey.clear(), #7448", function (assert) {
   const survey = new SurveyModel({
     elements: [
@@ -18385,4 +18391,4 @@ QUnit.test("defaultValueExpression expression stops working after survey.clear()
   survey.clear();
   q1.value = 4;
   assert.equal(q2.value, 4, "defaultValueExpression is working after set value directly & clear");
-});
\ No newline at end of file
+});