Styling issue when adding patterns

[bilalmughl]

Bug Report

Description

When attempting to add a new pattern using the Hello Elementor 3.0.1 Theme, a styling issue occurs.

Environment

• WordPress: 6.5-beta1
• PHP: 8.0.30-dev
• Server: PHP.wasm
• Database: WP_SQLite_Translator (Server: 5.5 / Client: 3.40.1)
• Browser: Chrome 121.0.0.0
• OS: Windows 10/11
• Theme: Hello Elementor 3.0.1
• MU Plugins:
  • 0-playground.php
  • 0-sqlite.php
  • WordPress WXZ Exporter 0.1
• Plugins:
  • Create Block Theme 1.13.8
  • Debug Bar 1.1.4
  • Health Check & Troubleshooting 1.7.0
  • Test Reports 1.1.0
  • User Switching 1.7.2
  • WordPress Importer Git loader 0.8.2

Steps to Reproduce

2. 🐞 Bug occurs. Install and activate the Hello Elementor 3.0.1 Theme. Navigate to the pattern library and try to add a new pattern.

Expected Results

1. ✅ The new pattern should be added seamlessly without any styling issues, integrating well with the existing layout.

Actual Results

1. ❌ Styling issues are observed, potentially disrupting the visual presentation of the newly added pattern.

Additional Notes

This problem specifically occurs when utilizing the Hello Elementor 3.0.1 Theme while trying to incorporate a new pattern into the design.

Supplemental Artifacts

Videos:
​https://take.ms/DlR9f
​https://take.ms/DlR9f

[swissspidy]

I just downloaded WordPress 6.5 Beta 1 from ​https://wordpress.org/news/2024/02/wordpress-6-5-beta-1/ and the wp-includes/css/classic-themes.min.css file definitely does exist. So it might be possible it got not fully copied over when installing the beta.

Have you tried re-installing the 6.5 Beta either manually or via Dashboard -> Updates?

[swissspidy]

Whoops, my bad for confusing this with #60538, the two looked very similar.

This might be an issue specific to Playground because of that missing stylesheet. Does the same happen when you install WordPress 6.5 Beta on a local test environment?

[bilalmughl]

The problem occurred during testing on Playground.