diff --git a/e2e/panels-suite/frontend-sandbox-panel.spec.ts b/e2e/panels-suite/frontend-sandbox-panel.spec.ts
index 09dc422b94c..69205f06e09 100644
--- a/e2e/panels-suite/frontend-sandbox-panel.spec.ts
+++ b/e2e/panels-suite/frontend-sandbox-panel.spec.ts
@@ -56,6 +56,7 @@ describe('Panel sandbox', () => {
         },
       });
 
+      cy.get('[data-testid="panel-editor-custom-editor-input"]').should('not.be.disabled');
       cy.get('[data-testid="panel-editor-custom-editor-input"]').type('x');
       cy.get('[data-sandbox-test="panel-editor"]').should('exist');
     });
@@ -112,6 +113,7 @@ describe('Panel sandbox', () => {
         },
       });
 
+      cy.get('[data-testid="panel-editor-custom-editor-input"]').should('not.be.disabled');
       cy.get('[data-testid="panel-editor-custom-editor-input"]').type('x');
       cy.wait(100); // small delay to prevent false positives from too fast tests
       cy.get('[data-sandbox-test="panel-editor"]').should('not.exist');