[lancewillett]

The classic menus "creates a menu, adds a custom link, and assigns it to a location" test passed only on retry in 7 of the 216 parallel E2E jobs that finished on November 6. It moved on before each save had finished loading, in two places.

What

1. After Create Menu (5 of 7 retries): the test checked that the Menu Name field showed "E2E Menu". The test had typed that value itself, so the check could pass on the create form before the page reloaded. The next step clicked Custom Links on the create form (?action=edit&menu=0, side panels disabled) and timed out waiting for the URL field. The test now waits for the redirect to ?menu=<id> first.
2. After Save Menu (2 of 7 retries): the test polled REST for the saved location. The server can save before the browser finishes loading the response, so the next page.goto( '/' ) failed with "interrupted by another navigation". The test now waits for the "E2E Menu has been updated." notice, which only the saved page shows.

Evidence

First-attempt errors from the retried jobs:

• locator.fill: Timeout 10000ms exceeded, waiting for getByRole('textbox', { name: 'URL' }): runs 42146221073, 42215459048, 42218822487, 42256787659, 42277031851.
• page.goto: Navigation to "http://localhost:8889/" is interrupted by another navigation: runs 42162810740, 42193906832.

No local reproduction; the cause is inferred from the errors and the nav-menus.php redirects.

Trac ticket: https://core.trac.wordpress.org/ticket/66455

Use of AI Tools

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Used for: Scanning CI logs, finding the cause, writing the change and this description.

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[lancewillett]

PR #15772 landed in https://core.trac.wordpress.org/changeset/65348