Black screen briefly appears on Connectors screen in WP 7.1-alpha

[sumitsingh]

When navigating to the Connectors screen in WordPress 7.1-alpha (build 62366), the screen briefly shows a black flash before rendering content. This seems like a rendering or initialization issue in the admin interface and could confuse users.

Steps to reproduce:
Install WordPress 7.1-alpha-62366.
Log in to the admin dashboard.
Navigate to Connectors.
Observe the black screen that appears briefly before the interface loads.

Expected behavior:
The Connectors screen should render smoothly without any black flash.

Observed behavior:
A black screen appears for a short time before the content loads.

Environment:
WordPress version: 7.1-alpha-62366
Site language: en_US
User language: en_US
Timezone: UTC+0
Home URL: ​https://playground.wordpress.net/scope:generous-noisy-garden
Site URL: ​https://playground.wordpress.net/scope:generous-noisy-garden
Permalink structure: /%year%/%monthnum%/%day%/%postname%/
HTTPS: Yes
Multisite: No
Registration allowed: No
Discourage search engines: No
Default comment status: Open
Environment type: Production
User count: 1
Communication with WordPress.org: Reachable

Quick recording available for reference.

[sumitsingh]

Black screen briefly appears on Connectors screen

[westonruter]

This may be addressed by #65215 through preloading the REST API requests for the plugins used on the Connectors screen.

[audrasjb]

Removing trunk version as this is not going to be shipped with WP 7.0 but in the next releases.

Use the boot layout background token for #wpwrap critical CSS instead of a foreground color fallback that rendered as near-black before React mounted.

Fixes #65247.

This is a change that would need to be applied to Gutenberg. See ​https://github.com/WordPress/gutenberg/blob/502be98431f7beac683e85895195f3fd1be77f7b/packages/wp-build/templates/page-wp-admin.php.template#L256-L313

See ​failing test:

[khokansardar]

@westonruter I've added the fixes here - ​https://github.com/WordPress/gutenberg/pull/78493

[wildworks]

#65292 was marked as a duplicate.

[JeffPaul]

Seems like this can be closed as its an upstream fix in Gb that could get backported for 7.0.1 if desired?