v8.9.0 doesn't find its way out of a gateway

[olemartinorg]

Description of the bug

When upgrading ttd/frontend-test to v8.9.0-preview.1, one of our e2e tests fail with Exclusive gateway AltinnExpressionsExclusiveGateway returned 0 flows. Expected 1 while testing the custom confirm gateway.

Steps To Reproduce

1. Check out the next-app-lib branch
2. Start the app
3. Run the Cypress test test/e2e/integration/frontend-test/custom-confirm.ts

Steps To Reproduce (manually)

1. Check out the next-app-lib branch
2. Start the app
3. Log in as a user
4. Click "Velg neste steg"
5. Choose "List (Task_5)" and "Gå til"
6. Pick someone in the list, click "Neste"
7. Choose "Ja, bruk egendefinert"
8. Click "Send inn"
9. Observe the page "Se over svarene dine før du sender inn"
10. Click "Send inn" again
11. Observe the error message appearing

Additional Information

No response

[ivarne]

Fixed in #1563