[westonruter]

What?

Follow up to #74490. Found in #86104.

Fixes the path that gutenberg_define_interactivity_modules_support() loads the script module registry from, so that it marks the block library's script modules as able to load on client-side navigation again.

Why?

The function reads the registry from build/modules/index.php, but #74490 renamed that file to build/modules/registry.php and did not update this caller. Since then, its file_exists() check has always failed, and it has returned without marking anything.

This has gone unnoticed because Core marks the block library modules it registers in wp_default_script_modules(), and that mark is kept when Gutenberg registers the modules again. All 10 of Gutenberg's current block library modules are also in Core, so none are affected today. A block library module that only Gutenberg has, though, would not be marked, so it would not be loaded on client-side navigation.

How?

• Load the registry from build/modules/registry.php, where wp-build writes it, as the generated build/modules.php already does.
• Remove the remove_action( 'wp_default_scripts', 'wp_define_interactivity_modules_support' ) call. Core has never defined that function, so the call has never done anything.

Testing Instructions

1. Run npm run build, and confirm that build/modules/registry.php exists and build/modules/index.php does not.
2. Save the following as check-registry-path.php in a directory that WP-CLI can read, and run it with wp eval-file check-registry-path.php (or npm run wp-env run cli wp eval-file …). It clears the marks that Core added, then runs only Gutenberg's function:

   <?php
   wp_scripts(); // Fires wp_default_scripts.
   $prop = new ReflectionProperty( WP_Interactivity_API::class, 'script_modules_that_can_load_on_client_navigation' );
   $prop->setValue( wp_interactivity(), array() );
   gutenberg_define_interactivity_modules_support();
   printf( "Marked: %d\n", count( $prop->getValue( wp_interactivity() ) ) );

3. On trunk, it prints Marked: 0. With this PR, it prints Marked: 10, one for each @wordpress/block-library/*/view module.
4. Optional smoke test: on the front end, check that client-side navigation still works for a Query Loop block with "Reload full page" disabled.

Testing Instructions for Keyboard

Not applicable. There are no UI changes.

Screenshots or screencast

Not applicable.

Use of AI Tools

This PR was written with Claude Code using Claude Opus 5.5 (medium effort), which found the stale path while typing the registry in #86104, traced it to #74490, verified the fix against a local site with WP-CLI, and drafted the change and this description. It was reviewed by a maintainer.

[github-actions]

🤖 PR meta 🤖

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⚡ Performance

Show the results

Client side metrics exclude the server response time.

front-end-block-theme

Metric	4f92695	trunk	% Change
timeToFirstByte	53.9 ms +4.27% -2.41%	54.7 ms +6.22% -3.84%	-1.46%
largestContentfulPaint	92 ms +4.35% -4.35%	92 ms +4.35% -8.7%	0%
lcpMinusTtfb	37.1 ms +9.7% -9.43%	33.5 ms +17.61% -4.63%	10.75%
wpBeforeTemplate	28.01 ms +12.82% -1.89%	28.41 ms +8.17% -3.2%	-1.41%
wpTemplate	21.56 ms +3.29% -3.62%	21.92 ms +5.2% -4.79%	-1.64%
wpTotal	50.08 ms +4.85% -2.26%	51.06 ms +6.35% -4.52%	-1.92%
wpMemoryUsage	7.72 MB +0% -0%	7.69 MB +0% -0%	0.43%
wpDbQueries	16 +0% -0%	16 +0% -0%	0%

front-end-classic-theme

Metric	4f92695	trunk	% Change
timeToFirstByte	44.95 ms +7.68% -2.89%	44.85 ms +5.91% -2.56%	0.22%
largestContentfulPaint	96 ms +4.17% -0%	96 ms +4.17% -0%	0%
lcpMinusTtfb	51.75 ms +1.16% -1.35%	51.7 ms +1.26% -1.06%	0.1%
wpBeforeTemplate	25.54 ms +13.08% -1.72%	25.41 ms +1.57% -1.02%	0.51%
wpTemplate	16.05 ms +3.05% -3.55%	16.27 ms +3.5% -3.87%	-1.35%
wpTotal	42.01 ms +7.5% -3.21%	41.77 ms +6.32% -2.11%	0.57%
wpMemoryUsage	6.41 MB +0% -0%	6.38 MB +0% -0%	0.53%
wpDbQueries	13 +0% -0%	13 +0% -0%	0%

media-processing

Metric	4f92695	trunk	% Change
mediaProcessingJpeg	401.52 ms +1.12% -0.53%	394.28 ms +0.74% -0.18%	1.84%
mediaProcessingAvif	6112.01 ms +0.18% -0.15%	6123.66 ms +0.23% -0.34%	-0.19%
mediaProcessingJpegToAvif	4199.01 ms +0.35% -0.2%	4204.91 ms +0.16% -0.03%	-0.14%

media-upload

Metric	4f92695	trunk	% Change
jpegUploadProcessing	1464.3 ms +33.87% -1.18%	1464.62 ms +0.67% -1.1%	-0.02%
pngUploadProcessing	171.11 ms +37.37% -4.67%	173.69 ms +33.9% -6.49%	-1.49%
largeJpegUploadProcessing	1451.54 ms +0.96% -0.62%	1457.3 ms +1.7% -0.38%	-0.4%
multipleImageUploadProcessing	2036.51 ms +0.71% -2.01%	2017.89 ms +3.84% -5.72%	0.92%

post-editor

Metric	4f92695	trunk	% Change
serverResponse	253.66 ms +8.65% -5.97%	263.67 ms +10.08% -3.3%	-3.8%
firstPaint	286.25 ms +15.06% -15.9%	323.2 ms +9.6% -21.26%	-11.43%
domContentLoaded	584.81 ms +2.92% -1.24%	617.66 ms +0.35% -1.42%	-5.32%
loaded	585.72 ms +2.9% -1.26%	618.6 ms +0.34% -1.43%	-5.32%
firstContentfulPaint	347.04 ms +4.2% -0.82%	361.08 ms +2.51% -1.9%	-3.89%
firstBlock	1461.25 ms +2.99% -0.91%	1547.63 ms +1.61% -0.43%	-5.58%
type	14.59 ms +3.22% -7.47%	14.28 ms +2.87% -4.48%	2.17%
typeWithoutInspector	13.51 ms +9.84% -9.47%	13.38 ms +8.59% -10.24%	0.97%
typeWithTopToolbar	16.03 ms +9.86% -5.8%	17.12 ms +4.38% -3.56%	-6.37%
typeContainer	6.17 ms +5.19% -5.67%	6.22 ms +3.54% -5.63%	-0.8%
focus	77.7 ms +5.08% -6.63%	75.51 ms +6.57% -5.48%	2.9%
firstFocus	169.28 ms +0% -0%	169.26 ms +0% -0%	0.01%
selectAll	263.1 ms +1.65% -7.67%	246.51 ms +0.85% -1.33%	6.73%
undo	21.24 ms +6.97% -4.8%	21.83 ms +3.07% -4.31%	-2.7%
listViewOpen	48.82 ms +4.79% -5.31%	49.53 ms +11.87% -10.72%	-1.43%
inserterOpen	29.86 ms +1.07% -4.25%	28.22 ms +4.22% -10.52%	5.81%
inserterHover	9.37 ms +10.78% -11.63%	8.48 ms +6.96% -9.43%	10.5%
inserterSearch	7.48 ms +2.41% -4.81%	6.6 ms +6.67% -3.79%	13.33%
loadPatterns	445.2 ms +3.38% -1.76%	493.78 ms +5.4% -4.49%	-9.84%
wpTotal	246.68 ms +8.96% -6.01%	256.56 ms +9.85% -3.39%	-3.85%
wpMemoryUsage	14.78 MB +0% -0%	14.74 MB +0% -0%	0.24%
wpDbQueries	55 +0% -0%	55 +0% -0%	0%

site-editor

Metric	4f92695	trunk	% Change
serverResponse	462.8 ms +2.39% -4.88%	468.54 ms +0.4% -8.76%	-1.23%
firstPaint	377.73 ms +14.73% -11.7%	359.25 ms +3.43% -12.55%	5.14%
domContentLoaded	874.31 ms +5.74% -1.76%	862.03 ms +0.63% -0.98%	1.42%
loaded	875.35 ms +5.72% -1.76%	863.14 ms +0.6% -1%	1.41%
firstContentfulPaint	510.66 ms +8.39% -2.49%	498.29 ms +2.39% -2.7%	2.48%
firstBlock	2575.74 ms +5.24% -0.95%	2555.65 ms +0.77% -0.77%	0.79%
type	17.93 ms +3.74% -8.64%	17.04 ms +7.69% -10.04%	5.22%
navigate	116.99 ms +2.56% -6.28%	116.6 ms +3.57% -7.25%	0.33%
loadPatterns	1348.02 ms +7.35% -2.82%	1316.68 ms +11.06% -13.32%	2.38%
loadPages	976.31 ms +3.65% -4.15%	992.36 ms +1.08% -1.52%	-1.62%
wpTotal	453.42 ms +2.43% -5.02%	459.07 ms +0.41% -8.93%	-1.23%
wpMemoryUsage	12.79 MB +0% -0%	12.76 MB +0% -0%	0.27%
wpDbQueries	45 +0% -0%	45 +0% -0%	0%

_{5fa74d7 Run}

🏁 Flaky tests

Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

Page List converts to Navigation Links with entity bindings in /test/e2e/specs/editor/blocks/navigation.spec.js, passed after 1 failed attempt.

Error: expect(locator).toContainText(expected) failed

Locator: getByRole('region', { name: 'Editor settings' }).getByRole('tabpanel', { name: 'Content' }).getByRole('button', { name: /Link to:/ })
Expected substring: "test-page-1"
Received string:    "Link to:Cat/catPagePublished"
Timeout: 5000ms

Call log:
  - Expect "toContainText" getByRole('region', { name: 'Editor settings' }).getByRole('tabpanel', { name: 'Content' }).getByRole('button', { name: /Link to:/ }) with timeout 5000ms
  - waiting for getByRole('region', { name: 'Editor settings' }).getByRole('tabpanel', { name: 'Content' }).getByRole('button', { name: /Link to:/ })
    14 × locator resolved to <button type="button" aria-expanded="false" aria-haspopup="dialog" class="components-button link-preview-button is-next-40px-default-size is-secondary">…</button>
       - unexpected value "Link to:Cat/catPagePublished"

    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/blocks/navigation.spec.js:1949:31

does not select blocks in the canvas preview when editing from the sidebar (Site Editor v2) in /test/e2e/specs/site-editor/navigation-sidebar-list-view.spec.js, passed after 1 failed attempt.

Error: expect(locator).toBeFocused() failed

Locator: getByRole('combobox', { name: 'Search or type URL' })
Expected: focused
Timeout: 5000ms
Error: element(s) not found

Call log:
  - Expect "toBeFocused" getByRole('combobox', { name: 'Search or type URL' }) with timeout 5000ms
  - waiting for getByRole('combobox', { name: 'Search or type URL' })

    at LinkControl.useLinkControlSearch (/home/runner/work/gutenberg/gutenberg/test/e2e/specs/site-editor/navigation-sidebar-list-view.spec.js:416:47)
    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/site-editor/navigation-sidebar-list-view.spec.js:179:21

should undo without broken temporary state in /test/e2e/specs/editor/blocks/image.spec.js, passed after 1 failed attempt.

Error: expect(received).toBe(expected) // Object.is equality

- Expected  - 2
+ Received  + 2

- <!-- wp:image -->
- <figure class="wp-block-image"><img alt=""/></figure>
+ <!-- wp:image {"id":26,"sizeSlug":"full","linkDestination":"none"} -->
+ <figure class="wp-block-image size-full"><img src="http://localhost:8889/wp-content/uploads/2026/11/eb2890f2-9b50-43fe-8c09-73c78308510e.png" alt="" class="wp-image-26"/></figure>
  <!-- /wp:image -->
    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/blocks/image.spec.js:432:49

_{5fa74d7 Run}