fix: update block version to 3

[Soare-Robert-Daniel]

Closes #2820.

Summary

• Bump the Block API version to 3.

Screenshots

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Test instructions

Part A — Quick health check

1. New page. 2. Console shows no "API version 2" / "added to the iframe incorrectly" messages. 3. Add each Otter block once — none go blank, error, or show
   "This block has encountered an error."

Part B — Most important blocks (test carefully)

• B1 Google Map — map appears, add/drag/delete marker, change style, zoom. Bug if: blank/gray, wrong size, markers won't move.
• B2 Leaflet Map — add/drag pin, open popup → "Delete Marker" works, make taller (no gray gap). Bug if: delete does nothing.
• B3 Slider — 3+ slides cycle with arrows/dots. Bug if: slides just stacked.
• B4 Lottie — animation plays/loops. Bug if: empty box.
• B5 Posts/Products — grid of posts; (Pro) products. Bug if: empty when posts exist.
• B6 Image — box-shadow with a theme palette color at opacity below 100% shows correct color. Bug if: turns black/disappears.

Part C — Other blocks (quick)

Review, Form, Countdown/Progress/Circle Counter, Animations, and the Pro/WooCommerce blocks — each appears, previews, and saves.

Part D — Published page unchanged

Publish a mixed-block page → looks the same as before. Open an old page → no "unexpected or invalid content" warning.

Where to test

Page editor (main), Tablet/Mobile preview, Site Editor, and older WordPress 6.3 (just Part A).

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Checklist before the final review

• Included E2E or unit tests for the changes in this PR.
• Visual elements are not affected by independent changes.
• It is at least compatible with the minimum WordPress version.
• It loads additional script in frontend only if it is required.
• Does not impact the Core Web Vitals.
• In case of deprecation, old blocks are safely migrated.
• It is usable in Widgets and FSE.
• Copy/Paste is working if the attributes are modified.
• PR is following the best practices

[pirate-bot]

Bundle Size Diff

Package	Old Size	New Size	Diff
Animations	178.24 KB	178.27 KB	22 B (0.01%)
Blocks	1.47 MB	1.47 MB	1.38 KB (0.09%)
CSS	7.87 KB	7.87 KB	0 B (0.00%)
Dashboard	108.48 KB	108.48 KB	0 B (0.00%)
Onboarding	68.14 KB	68.14 KB	0 B (0.00%)
Export Import	4.7 KB	4.7 KB	0 B (0.00%)
Pro	299.31 KB	301.29 KB	1.98 KB (0.66%)

[pirate-bot]

Plugin build for 57ef4ed is ready 🛎️!

• Download Otter – Page Builder Blocks & Extensions for Gutenberg - Production ~ Development
• Download Otter Pro - Production ~ Development
• Download Blocks Animation - Production ~ Development
• Download Blocks CSS - Production ~ Development
• Download Blocks Export Import - Production ~ Development

[pirate-bot]

E2E Tests

Playwright Test Status: See serial and parallel matrix jobs

Performance Results

serverResponse: {"q25":390.1,"q50":409.9,"q75":415.5,"cnt":10}, firstPaint: {"q25":507.6,"q50":607,"q75":683.6,"cnt":10}, domContentLoaded: {"q25":2970.1,"q50":2995.6,"q75":3009.5,"cnt":10}, loaded: {"q25":2971.8,"q50":2997.5,"q75":3011.5,"cnt":10}, firstContentfulPaint: {"q25":3481.9,"q50":3507.3,"q75":3522.2,"cnt":10}, firstBlock: {"q25":13400.7,"q50":13472.7,"q75":13516.8,"cnt":10}, type: {"q25":21.64,"q50":22.17,"q75":24.88,"cnt":10}, typeWithoutInspector: {"q25":19.17,"q50":20.28,"q75":21,"cnt":10}, typeWithTopToolbar: {"q25":26.59,"q50":27.21,"q75":28.13,"cnt":10}, typeContainer: {"q25":12.72,"q50":13.78,"q75":16.18,"cnt":10}, focus: {"q25":108.99,"q50":111.85,"q75":114.28,"cnt":10}, inserterOpen: {"q25":36.02,"q50":36.41,"q75":37.18,"cnt":10}, inserterSearch: {"q25":12.85,"q50":12.98,"q75":13.25,"cnt":10}, inserterHover: {"q25":5.1,"q50":5.17,"q75":5.4,"cnt":20}, loadPatterns: {"q25":1414.71,"q50":1435.09,"q75":1451.63,"cnt":10}, listViewOpen: {"q25":221.55,"q50":224.53,"q75":235.92,"cnt":10}

[poonam279]

@Soare-Robert-Daniel, I tested the PR following the provided test instructions and found two issues:

1. The form icons are not showing in the form block

2. After updating the plugins on an existing site, one of the Leaflet maps is not rendered in the backend.

The issue is intermittent and is not reproducible on every installation. Interestingly, another map on the same page loads as expected, while this specific map does not.

You can check the page here https://succeedbook.s2-tastewp.com/wp-admin/post.php?post=12&action=edit
user: poonam
Password: FQ4jgLQPmDM

[poonam279]

@Soare-Robert-Daniel, If we add more than one Google Map block, save the page, and then reload the editor, only the first map appears. The other maps show this error:

“This block has encountered an error and cannot be previewed.”

The console also shows this error:

TypeError: Cannot read properties of null (reading 'setOptions')
at edit.js:107:19

Also, with WordPress 6.3, the plugin is not working. It does not show any blocks or settings. However, I checked with WordPress 6.2.9 and 6.4, and it works fine there.