Fix NotFoundSetOnFormSubmit_ResponseNotStarted_SSR test and enhanced navigation timing issue #62541
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github-actions bot added the needs-area-label 
…ce navigation timing Co-authored-by: ilonatommy <32700855+ilonatommy@users.noreply.github.com>
Copilot AI changed the title NotFoundSetOnFormSubmit_ResponseNotStarted_SSR test Copilot finished work on behalf of ilonatommy July 2, 2025 13:52
ilonatommy reviewed Jul 2, 2025
…/else logic in NotFoundSetOnFormSubmit_ResponseNotStarted_SSR test Co-authored-by: ilonatommy <32700855+ilonatommy@users.noreply.github.com>
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This PR addresses a timing issue in enhanced navigation where
NotFoundcalls made synchronously could reach the enhanced navigation code before proper initialization, causing undefined access errors.Changes Made
1. Test URL Correction
Fixed
NotFoundSetOnFormSubmit_ResponseNotStarted_SSRtest to use the correct URL:/post-not-found-ssr-streaming(streaming enabled)/post-not-found-ssr(streaming disabled)The test name explicitly mentions "ResponseNotStarted" which should test non-streaming scenarios where the response hasn't started streaming yet.
2. Enhanced Navigation Timing Fix
The core issue was a race condition where synchronous
NotFoundcalls could triggerperformEnhancedPageLoadbeforenavigationEnhancementCallbackswas initialized.Root Cause: When forms submit and immediately call
NotFound, the enhanced navigation code path executes before the boot function completes initialization.Solution:
navigationEnhancementCallbacksfrom direct assignment to a promise-based patternperformEnhancedPageLoadnow awaits the callbacks promise, ensuring they're available before useFixes #62540.
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