Title: VIP MU plugins v20260721.1
Author: WordPress VIP Documentation
Published: July 21, 2026

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 1. [Changelog](https://docs.wpvip.com/changelog/)
 2. [VIP MU plugins [Staging]](https://docs.wpvip.com/changelog/vip-mu-plugins-staging/)
 3. VIP MU plugins v20260721.1

# VIP MU plugins v20260721.1

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 21 July 2026

18:20:59 GMT+0000

 [ VIP MU plugins [Staging] ](https://docs.wpvip.com/changelog/vip-mu-plugins-staging/)

 [ GitHub  ](https://github.com/Automattic/vip-go-mu-plugins/pull/7126)

 [ Permalink  ](https://docs.wpvip.com/changelog/vip-mu-plugins-staging/vip-mu-plugins-v20260721-1/)

View Pull Request: [https://github.com/Automattic/vip-go-mu-plugins/pull/7126](https://github.com/Automattic/vip-go-mu-plugins/pull/7126)

### Fixed

 * Fixed `admin_url()` resolving to the production hostname on sandboxes, which 
   caused cross-origin request failures for AJAX calls using `admin-ajax.php`.
 * Real-Time Collaboration: Preserved collaborators’ unsaved content and post meta
   when another user saves, prevented redundant empty autosave revisions, and restored
   undo and redo when plugins with incompatible meta boxes disable collaboration.
 * Real-Time Collaboration: Disabled Quick Edit for posts with active collaborative
   sessions and improved remote cursor and selection positioning while resizing 
   the browser window.

### Changed

 * Real-Time Collaboration: Updated the bundled Gutenberg integration from the `
   0.2-20260706-pr79021` build based on Gutenberg 23.5.0 to the `0.2-20260720-pr79021`
   build based on the July 20 Gutenberg trunk snapshot. The VIP RTC plugin remains
   at v0.3.2.
 * Real-Time Collaboration: Added independent controls for collaborator join, leave,
   and post-update notifications, and avoided synchronous CRDT updates while editing
   alone to reduce typing latency outside active collaboration.
 * Updated the wp-parsely submodule (used for local development environments) to
   version 3.23.4.