WP 6.4 - Front End Does Not Work On Windows Machines

[nick6352683]

Description

This bug was also happening during the beta phases of WP 6.3, which was eventually fixed, but the issue is back - I have a feeling it has to do with caching.

In the backend all seems ok (although I only tested it for 2-3 minutes so far), but on the front end it's a nightmarish mess - Xampp php 7.4 Windows 10, no plugins active and the newest default theme. Installed from the WP 6.4beta1 zip file.

Also tested on InstaWP using the WP Beta plugin, and everything is working as expected including my custom made hybrid theme.

With WP 6.3 the manual fix was doing the trick: In the file wp-includes/blocks/index.php file on line 49 we could change the code:

from
$files = $cached_files['files'];
to
$files = false;

Now this code is on line 65, but the old code replacement is not working with 6.4 beta1.

Step-by-step reproduction instructions

1. Install WP 6.4 beta1 on a Windows PC
2. See the front end.

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[t-hamano]

Thanks for the report, @nick6352683.

Looking at the code you mentioned, it might be related to the following problem we've had in the past:

• 6.3-beta: navigation block CSS is not output on the front-end #52391
• [WP6.3] Styles not applied to some blocks #52199

I was also able to reproduce the problem on my Windows machine:

• Fresh install WP6.3.1 using Local app
• Intall Beta Tester Plugin
• Update to WordPress 6.4 Nightly (WordPress 6.4-beta1-56736)
• In the front end, some blocks are not styled

This issue was previously resolved in the following core changeset: https://core.trac.wordpress.org/changeset/56136

I'd like to find out why this problem started happening again.

[t-hamano]

I have posted the cause and solution for this issue in a core ticket: https://core.trac.wordpress.org/ticket/59489

[nick6352683]

@t-hamano , your fix works like a charm, your skills are amazing !!!

Thanks a million, I can now start testing my themes and plugins and prepare for WP 6.4...

[joemcgill]

Anyone else experiencing this issue, please test and give feedback on https://core.trac.wordpress.org/ticket/59489. I've update the PR from @t-hamano in WordPress/wordpress-develop#5409.

[t-hamano]

Thank you for improving the patch and committing to core, @joemcgill!

I've confirmed that this issue has been resolved in the latest WordPress trunk, so I'd like to close this issue.

Test Report

• Use Local App on my Windows 11 machine
• Updated to WordPress 6.4 Beta 2 via the Beta Teter plugin
• The problem is reproduced with TT2, TT3, TT4 theme
• Updated to WordPress 6.4 nightly (WordPress 6.4-beta2-56785) via the Beta Teter plugin
• The problem is NOT reproduced with TT2, TT3, TT4 theme