skip test until issue is solved (#12929)

frontend/test/metabase/scenarios/admin/datamodel/field.cy.spec.js

@@ -142,10 +142,11 @@ describe("scenarios > admin > datamodel > field", () => {
       cy.contains("Title");
     });
 
-    it("lets you change to 'Custom mapping' and set custom values", () => {
+    it.skip("lets you change to 'Custom mapping' and set custom values (Issue #12771)", () => {
       visitAlias("@ORDERS_QUANTITY_URL");
 
       cy.contains("Use original value").click();
+      // *** Clicking this button starts a loop
       cy.contains("Custom mapping").click();
 
       cy.get('input[value="0"]')