Scripts and styles from the plugin are loaded everywhere, even when not needed.
Text strings aren’t translatable or plugin ignores multilingual frameworks.
Publishing queue or cron events break due to plugin interference.
Features or settings are available to users who shouldn’t access them.
Plugin stops working after upgrading PHP version on the server.
The plugin generates extra pages, posts, or archives, harming SEO.
The plugin interferes with wp-login.php or custom login processes.
Plugin functionality breaks because it depends on old jQuery versions.
A plugin blocks or corrupts responses from the WordPress REST API.
Plugin breaks or causes issues when activated in WordPress multisite environments.
Activating or updating a plugin results in a blank screen across the site or admin area.
Plugin clutters the dashboard with persistent or misleading notices.
A plugin injects its own styles that override the theme’s CSS.
Plugin’s settings screen gets stuck on loading animation or shows no content.
Plugin settings don’t save or revert after clicking Save Changes.
After activation, the admin menu disappears or dashboard becomes inaccessible.
Uninstalled plugin leaves behind database tables or files.
A plugin interferes with WordPress or theme update processes.
A plugin contains security flaws that could be exploited by attackers.
Two plugins interfere with each other, causing broken functionality or errors.