WP Automatic Updates broken 4.9.3

[paultgoodchild]

It seems that a somewhat innocuous quick addition to 4.9.3 has broken WP automatic updates for anything except the WordPress core.

How?

wp-includes/update.php the following code has been added:

<?php
        // Trigger background updates if running non-interactively, and we weren't called from the update handler.
        if ( $doing_cron && $has_auto_update && ! doing_action( 'wp_maybe_auto_update' ) ) {
                include_once( ABSPATH . '/wp-admin/includes/update.php' );

                // Only trigger background updates if an acceptable autoupdate is on offer, avoids needless extra API calls.
                if ( find_core_auto_update() ) {
                        do_action( 'wp_maybe_auto_update' );
                }
        }

This is plainly wrong, since you're saying: "Only fire automatic updates if there are available WP core updates"

What about plugins and themes?

Solution is to remove the following check and revert it back to a pre-4.9.3 state.

<?php
                if ( find_core_auto_update() ) { ...

[dd32]

The affected code has started to be reverted with [42653] in #43103.

[dd32]

In 42654:

Updates: Partially revert [42584], as this branch of code should always be run after a core update check.

This code branch is responsible for running all autoupdates, including plugins and themes - which should run regardless of if there's a core autoupdate available.

This revert does not revert the $timeout changes, as these should still use cached data if it's available.
Ideally this should be decoupled from the core update check to allow background updates to operate even when the core update check is disabled or running more often than twice daily.

Merges [42653] to the 4.9 branch.
Fixes #43103, #43235.

[ocean90]

#43247 was marked as a duplicate.