9 September

WordPress 5.5.1 Version Released- Bug Fixes & Features for Web Development

WordPress 5.5.1 was released a few days back with 34 bug fixes, 4 enhancements, and 5 bug fixes for website development. Version 5.5 when released removed 19 outdated JavaScript localization objects. This was done in favor of using the new functions found in the i18n package released with WordPress 5.0. A prominent change in this 5.5.1 release is the inclusion of backfill for the deprecated JavaScript globals, which were creating troubles with several popular plugins and themes. Theme and plugin developers still have to update to use wp.i18n but in the meantime, the outdated code will not block JavaScript execution.

WordPress 5.5 was released to improve the overall performance but the result was completely opposite. The upgrade is causing serious troubles to the users during WordPress Website Development and to ease this issue Enable jQuery Migrate Helper plugin was released. The plugin is available for users to address problems with jQuery after updating to WP 5.5.

WordPress 5.5 turned off jQuery Migrate which was serving users to help plugins and themes to run smoothly with outdated code. By turning jQuery Migrate off, multiple outdated plugins and themes no longer perform in a proper manner, which triggers broken website issues?

How to Update to WordPress 5.5.1?

WordPress 5.5.1 version has the capability to fix incorrect XML sitemaps pagination, adds the site environment to debug information, as well as improves multiple features that shipped with defects. To update to WP 5.5.1 proper steps need to be followed, to ensure no issues appear at the later stages. The full list of changes & bugs will be discussed in the later part of the blog.

Step-by-step WordPress Update Instructions

To assist you in safe and easy update to the newest version of WordPress, it is important to follow some proper guidelines.

1. Save your WordPress XML File

Simply click on the Tools icon in the left sidebar and next Export. Now, click on Download Export File. Create a new folder on your hard drive to keep all your Website files. Name it WP Backup to save all backup files. It is a great idea to back up once a week/month or when an update is needed. If you post on a regular basis, backup your site frequently.

2. Backup Your WordPress Database

If you are using Managed WordPress Hosting platform, open your hosting Dashboard, and create a backup. On most of the WordPress, Managed host backup can be created using the dashboard. If you are on shared hosting, you can hire WordPress experts for taking website backup. The database backup can be performed using the plugin as well to repair and optimize your database. Updating should not be ignored or put off. Every update boosts security standard and that’s why hackers always target websites that are not maintained.

3. FTP into Your Web Server

This is like having a copy off your server. That backup won’t do you any good if the server crashes has issues. Even better, save the backup file in the cloud or on an external drive in case you have PC problems. Download your theme/plugins/child theme folders to your hard disk. This is just perfect if you have customized any theme files. Better yet, download your whole wp-content directory.

WordPress 5.5.1 offers following Bug Fixes

• #50882 – Administration: WP 5.5: Cannot attribute content when deleting users
• #50998 – Quick/Bulk Edit: Editing posts using bottom “Bulk actions” dropdown menu doesn’t work
• #38009 – Comments: #reply-title.comment-reply-title not updating when replying to an individual
• #50845 – Editor: Block patterns: Fix translatable strings (take 2)
• #50858 – Site Health: Check PHP notices with site_status_tests filter
• #50887 – Site Health: Add site environment to debug information
• #50892 – Editor: Some block patterns have text contrast issues with dark themes
• #50910 – Sitemaps: 5.5 Sitemap URLs are incorrectly paginated
• #50912 – Site Health: flags define WP_AUTO_UPDATE_CORE value as an error
• #50919 – Script Loader: Change the jquery handle back to an alias for jquery-core
• #50933 – Media: Lazy loading in 5.5 causes flashing of custom logo in Firefox
• #50945 – Site Health: don’t give a warning when upload_max_size is lower than max_post_size
• #50988 – Upgrade/Install: Pass details about the specific plugin and theme updates attempted to filters
• #50992 – Bootstrap/Load: Remove the ability to alter the list of environment types in wp_get_environment_type()
• #50999 – Script Loader: Disable concatenation for scripts with translations to ensure they are printed in the right order
• #51011 – Upgrade/Install: Empty string comparison on home option during DB upgrades is invalid
• #51018 – Editor: PHP Notice thrown when searching for certain terms via the Gutenberg block directory
• #51151 – Editor: Packages update
• #51021 – REST API: Permit uniqueItems keyword in endpoint args
• #51146 – REST API: Fix multi-type schemas with integer fields
• #51029 – Filesystem API: Typo in variable name causes warning from fclose()
• #51042 – Post: missing excerpt
• #51050 – Docs: Add docblock for get_the_archive_title() filter
• #51052 – Administration: Undefined index: update-supported
• #51060 – Docs: Update register_rest_route docblock to reflect additions since 5.5
• #51064 – Bootstrap/Load: Consider adding “local” as environment on WP_ENVIRONMENT_TYPE
• #51073 – Administration: Extra padding below the admin bar
• #51075 – Docs: Update docs for custom logo functions
• #51122 – Docs: add a mention about the use of loading attribute in wp_get_attachment_image function
• #51127 – UI/CSS: Remove non-color related styling from Modern color scheme
• #51129 – Upgrade/Install: Only display the auto-update links on the Network Admin > Themes screen for themes that support the feature
• #51337 – Template: wp_terms_checklist not checking selected taxonomy items with selected_cats option
• #51184 – get_the_date() checks $format only for empty variable and fails on false boolean
• #51182 – Theme_Installer_skin::do_overwrite does not work on a Windows server
• #38009 – #reply-title.comment-reply-title not updating when replying to an individual
• #51123 – commonL10n and other JS globals removed without backwards compatibility
• #50848 – Clarify the usage of null for auto_update_{$type} filter
• #51081 – Fatal Error – Undefined get_page_templates() in Customizer
• #51154 – sitemaps should be initialized before each test is run
• #51028 – Dot should be out of the quotes

So, these are the major fixes that were missing in WordPress 5.5 features. The features are worthy but having breaking website issue is not acceptable.

Frequently Asked Questions


1. What is WordPress used for?

WordPress is, by far, the most popular open source Content Management System, used by approximately 75 million websites. WordPress is free to install, deploy, and upgrade. Thousands of plugins and templates power a flexible and simple interface, which reduces development costs and deployment time.

2. Is WordPress for free?

The WordPress software itself is 100% free and open source. Open-source software is, by definition, publicly accessible. WordPress itself is available through what’s called a General Public License.

3. What is WordPress and how does it work?

Simply put, WordPress is web publishing software you can use to create your own website or blog. Since it was released in 2003, WordPress has become one of the most popular web publishing platforms. And today it powers more 35% of the entire web — everything from hobby blogs to some of the most popular websites online.


This WordPress 5.5.1 update is designed to fix a wide range of bugs that were discovered with WP 5.5 released. For those that updated their sites to WordPress 5.5 and experiencing breaking their site’s concern, this is the version that should be downloaded. Problems that were discovered have been resolved. If you need the right assistance, consult WordPress customization service for optimum results from a reputed website development company.

Do You Need Help with WordPress 5.5.1 Upgrade? Avail Our Professional WordPress Services.