From 4d1a69212e27eabc1ca9350e990e2674641af428 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1s=20Castillo?= <tcastilloboireau@gmail.com>
Date: Tue, 26 May 2026 15:37:09 -0300
Subject: [PATCH 1/2] fix: adjust new value function to keep immutability
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Tomás Castillo <tcastilloboireau@gmail.com>
---
 .../additional-input/meta-field-values.js             | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/components/mui/formik-inputs/additional-input/meta-field-values.js b/src/components/mui/formik-inputs/additional-input/meta-field-values.js
index de179930..67fb685a 100644
--- a/src/components/mui/formik-inputs/additional-input/meta-field-values.js
+++ b/src/components/mui/formik-inputs/additional-input/meta-field-values.js
@@ -44,12 +44,11 @@ const MetaFieldValues = ({
   };
 
   const handleAddValue = () => {
-    const newFields = [...metaFields];
-    newFields[fieldIndex].values.push({
-      value: "",
-      name: "",
-      is_default: false
-    });
+    const newFields = metaFields.map((f, i) =>
+      i === fieldIndex
+        ? { ...f, values: [...f.values, { value: "", name: "", is_default: false }] }
+        : f
+    );
     setFieldValue(baseName, newFields);
   };
 

From fb421ce9ece07044fc392bae6a0d9f4c44349118 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tom=C3=A1s=20Castillo?= <tcastilloboireau@gmail.com>
Date: Tue, 26 May 2026 18:15:54 -0300
Subject: [PATCH 2/2] fix: add unit test to check immutability of new fields
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Tomás Castillo <tcastilloboireau@gmail.com>
---
 .../__tests__/additional-input-list.test.js   | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/src/components/mui/__tests__/additional-input-list.test.js b/src/components/mui/__tests__/additional-input-list.test.js
index 42a421fd..0db6d195 100644
--- a/src/components/mui/__tests__/additional-input-list.test.js
+++ b/src/components/mui/__tests__/additional-input-list.test.js
@@ -149,6 +149,47 @@ describe("AdditionalInputList", () => {
         expect(screen.getByTestId("field-count")).toHaveTextContent("2");
       });
     });
+
+    test("new meta field starts with empty values when an existing field already has values", async () => {
+      let capturedFields = null;
+
+      const TestWrapper = () => {
+        const { values } = useFormikContext();
+        capturedFields = values.meta_fields;
+        return <AdditionalInputList {...defaultProps} />;
+      };
+
+      render(
+        <Formik
+          initialValues={{
+            meta_fields: [
+              {
+                id: 1,
+                name: "Color",
+                type: "CheckBoxList",
+                is_required: false,
+                minimum_quantity: 0,
+                maximum_quantity: 0,
+                values: [{ name: "Red", value: "red", is_default: false }]
+              }
+            ]
+          }}
+          onSubmit={jest.fn()}
+        >
+          <Form>
+            <TestWrapper />
+          </Form>
+        </Formik>
+      );
+
+      const addButton = screen.getByTestId("add-btn-0");
+      await userEvent.click(addButton);
+
+      await waitFor(() => {
+        expect(capturedFields).toHaveLength(2);
+        expect(capturedFields[1].values).toEqual([]);
+      });
+    });
   });
 
   describe("handleRemove", () => {