diff --git a/superset-frontend/cypress-base/cypress/integration/dashboard/filter.test.ts b/superset-frontend/cypress-base/cypress/integration/dashboard/filter.test.ts
index 6afe2c6190..375f14dacd 100644
--- a/superset-frontend/cypress-base/cypress/integration/dashboard/filter.test.ts
+++ b/superset-frontend/cypress-base/cypress/integration/dashboard/filter.test.ts
@@ -70,8 +70,8 @@ describe('Dashboard filter', () => {
           }
           expect(requestFilter).deep.eq({
             col: 'region',
-            op: '==',
-            val: 'South Asia',
+            op: 'IN',
+            val: ['South Asia'],
           });
         });
       });
diff --git a/superset-frontend/cypress-base/cypress/integration/dashboard/tabs.test.ts b/superset-frontend/cypress-base/cypress/integration/dashboard/tabs.test.ts
index d4ec42e0df..85b8f51dee 100644
--- a/superset-frontend/cypress-base/cypress/integration/dashboard/tabs.test.ts
+++ b/superset-frontend/cypress-base/cypress/integration/dashboard/tabs.test.ts
@@ -121,8 +121,8 @@ describe('Dashboard tabs', () => {
         const requestParams = JSON.parse(requestBody.form_data as string);
         expect(requestParams.extra_filters[0]).deep.eq({
           col: 'region',
-          op: '==',
-          val: 'South Asia',
+          op: 'IN',
+          val: ['South Asia'],
         });
       });
     });
@@ -136,8 +136,8 @@ describe('Dashboard tabs', () => {
       const requestParams = JSON.parse(requestBody.form_data as string);
       expect(requestParams.extra_filters[0]).deep.eq({
         col: 'region',
-        op: '==',
-        val: 'South Asia',
+        op: 'IN',
+        val: ['South Asia'],
       });
       expect(requestParams.viz_type).eq(LINE_CHART.viz);
     });
@@ -150,8 +150,8 @@ describe('Dashboard tabs', () => {
     cy.wait('@v1ChartData').then(({ request }) => {
       expect(request.body.queries[0].filters[0]).deep.eq({
         col: 'region',
-        op: '==',
-        val: 'South Asia',
+        op: 'IN',
+        val: ['South Asia'],
       });
     });
 
diff --git a/superset-frontend/src/visualizations/FilterBox/FilterBox.jsx b/superset-frontend/src/visualizations/FilterBox/FilterBox.jsx
index cbe95664e8..59c906222c 100644
--- a/superset-frontend/src/visualizations/FilterBox/FilterBox.jsx
+++ b/superset-frontend/src/visualizations/FilterBox/FilterBox.jsx
@@ -22,7 +22,7 @@ import { debounce } from 'lodash';
 import { max as d3Max } from 'd3-array';
 import { AsyncCreatableSelect, CreatableSelect } from 'src/components/Select';
 import Button from 'src/components/Button';
-import { t, SupersetClient } from '@superset-ui/core';
+import { t, SupersetClient, ensureIsArray } from '@superset-ui/core';
 
 import {
   BOOL_FALSE_DISPLAY,
@@ -158,10 +158,9 @@ class FilterBox extends React.PureComponent {
     if (options !== null) {
       if (Array.isArray(options)) {
         vals = options.map(opt => (typeof opt === 'string' ? opt : opt.value));
-      } else if (options.value) {
-        vals = options.value;
       } else {
-        vals = options;
+        // must use array member for legacy extra_filters's value
+        vals = ensureIsArray(options.value ?? options);
       }
     }