PHP notices at plugin activation

Here is more detailed info:

The reported error is on uploading a plugin zip, not on activation, sorry for that.

The PHP version is 7.4.3

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Installing a plugin by uploading the zip from the pc:

Trying to access array offset on value of type bool in wp-admin/includes/class-wp-filesystem-direct.php:226

Stack:

wp-admin/includes/class-wp-filesystem-direct.php:226
WP_Filesystem_Direct->owner()
wp-admin/includes/class-wp-filesystem-direct.php:597
WP_Filesystem_Direct->dirlist()
wp-admin/includes/class-wp-upgrader.php:497
WP_Upgrader->install_package()
wp-admin/includes/class-wp-upgrader.php:789
WP_Upgrader->run()
wp-admin/includes/class-plugin-upgrader.php:108
Plugin_Upgrader->install()
wp-admin/update.php:164

The number of notices varies by the plugin. E.g. a plugin that contains only a readme and one php file generates 8 messages, the plugin that triggers 710 msgs has 92 files and 8 subdirs with content.

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Deleting a plugin or updating a plugin directly from the item in the plugins page:

PHP Errors in Ajax Response query-monitor.js:316:13
{…}
​component: “Core”
​file: “wp-admin/includes/class-wp-filesystem-direct.php”
​line: 226
​message: “Trying to access array offset on value of type bool”
​stack: (6) […]
​​0: “WP_Filesystem_Direct->owner()”
​​1: “WP_Filesystem_Direct->dirlist()”
​​2: “WP_Filesystem_Direct->delete()”
​​3: “delete_plugins()”
​​4: “wp_ajax_delete_plugin()”
​​5: “do_action(‘wp_ajax_delete-plugin’)”
​​length: 6
​​
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The plugins work correctly.

Hope this helps.

Fixed WP 5.4 RC1
Thank you.