fix(PickerGroup): confirm event missing params (#11566)

packages/vant/src/picker-group/PickerGroup.tsx

@@ -85,6 +85,7 @@ export default defineComponent({
             class={bem('tabs')}
             shrink
             animated
+            lazyRender={false}
           >
             {props.tabs.map((title, index) => (
               <Tab title={title} titleClass={bem('tab-title')}>

packages/vant/src/picker-group/test/index.spec.tsx

@@ -6,6 +6,62 @@ import { PickerGroup } from '..';
 test('should emit confirm event after clicking the confirm button', async () => {
   const value1 = ref(['1']);
   const value2 = ref(['2']);
+  const value3 = ref(['3']);
+
+  const wrapper = mount({
+    setup(props, { emit }) {
+      const onConfirm = (params: PickerConfirmEventParams) => {
+        emit('confirm', params);
+      };
+
+      return () => (
+        <PickerGroup
+          title="Title"
+          tabs={['Tab1', 'Tab2', 'Tab3']}
+          onConfirm={onConfirm}
+        >
+          <Picker
+            v-model={value1.value}
+            columns={[{ text: '1', value: '1' }]}
+          />
+          <Picker
+            v-model={value2.value}
+            columns={[{ text: '2', value: '2' }]}
+          />
+          <Picker
+            v-model={value3.value}
+            columns={[{ text: '3', value: '3' }]}
+          />
+        </PickerGroup>
+      );
+    },
+  });
+
+  await wrapper.find('.van-picker__confirm').trigger('click');
+  expect(wrapper.emitted('confirm')![0]).toEqual([
+    [
+      {
+        selectedIndexes: [0],
+        selectedOptions: [{ text: '1', value: '1' }],
+        selectedValues: ['1'],
+      },
+      {
+        selectedIndexes: [0],
+        selectedOptions: [{ text: '2', value: '2' }],
+        selectedValues: ['2'],
+      },
+      {
+        selectedIndexes: [0],
+        selectedOptions: [{ text: '3', value: '3' }],
+        selectedValues: ['3'],
+      },
+    ],
+  ]);
+});
+
+test('should switch to next step when click confirm button', async () => {
+  const value1 = ref(['1']);
+  const value2 = ref(['2']);
 
   const wrapper = mount({
     setup(props, { emit }) {