What’s new in WordPress 5.5.1? 44 bugs fixed

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On September 1, 2020, WordPress 5.5.1 was released with bugs fixed. The update fixes 44 bugs. Here are the fixes and how to update.

Release Date

WordPress 5.5.1 was released on September 1, 2020.

WordPress 5.5 was released on August 11, 2020, so it will be a minor update about 20 days later.

New features and changes for WordPress 5.5 are described below.


Updating to WordPress 5.5.1 will fix the following 44 bugs. They are grouped by component.

UsersCannot attribute content when deleting users
Quick/Bulk EditEditing posts using bottom “Bulk actions” dropdown menu doesn’t work
Commentsreply-title.comment-reply-title not updating when replying to an individual
Editor・Fix translatable strings (take 2)
・Some block patterns have text contrast issues with dark themes
・PHP Notice thrown when searching for certain terms via the Gutenberg block directory
・Packages update
・Fix missing selected block highlighting in list view
・Fix specificity for buttons with outline style and background colors
・Fix incorrect aria description in List View
・Fix regression bug for category select in QueryControls component
・Fix tiny editor preview when using Mobile or Tablet options with metaboxes enabled
Site Health・Check PHP notices with site_status_tests filter
・Add site environment to debug information
・don’t give a warning when upload_max_size is lower than max_post_size
・flags define WP_AUTO_UPDATE_CORE value as an error
Sitemaps5.5 Sitemap URLs are incorrectly paginated
Script Loader・Change the jquery handle back to an alias for jquery-core
・Disable concatenation for scripts with translations to ensure they are printed in the right order
・commonL10n and other JS globals removed without backwards compatibility
MediaLazy loading in 5.5 causes flashing of custom logo in Firefox
Upgrade/Install・Pass details about the specific plugin and theme updates attempted to filters
・Empty string comparison on home option during DB upgrades is invalid
・Only display the auto-update links on the Network Admin > Themes screen for themes that support the feature
・Theme_Installer_skin::do_overwrite does not work on a Windows server
・Clarify the usage of null for auto_update_{$type} filter
REST API・Permit uniqueItems keyword in endpoint args
・Fix multi-type schemas with integer fields
Filesystem APITypo in variable name causes warning from fclose()
Postmissing excerpt
Docs・Add docblock for get_the_archive_title() filter
・Update register_rest_route docblock to reflect additions since 5.5
・Update docs for custom logo functions
・add a mention about the use of loading attribute in wp_get_attachment_image function
・Extra padding below the admin bar
UI / CSSRemove non-color related styling from Modern color scheme
Templatewp_terms_checklist not checking selected taxonomy items with selected_cats option
Date/Timeget_the_date() checks $format only for empty variable and fails on false boolean
CustomizeFatal Error – Undefined get_page_templates() in Customizer
Build/Test Toolssitemaps should be initialized before each test is run
Help/AboutDot should be out of the quotes
Bootstrap/Load・Remove the ability to alter the list of environment types in wp_get_environment_type()
・Consider adding “local” as environment on WP_ENVIRONMENT_TYPE

Server Requirements

The following requirements are recommended to run WordPress 5.5.1.

How to update

To update to WordPress 5.5.1, click the Update Now button on the Dashboard Update page.

If auto-update is enabled, the update will start in the background.

How to download

WordPress 5.5.1 is available on the download page.

For more information on how to download WordPress, please refer to the following article.

How to downgrade

Install WP Downgrade | Specific Core Version and downgrade to WordPress 5.5.

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