6.0.1 – forces autoupdate on some instances

Hello,
Seems like version 6.0.1 does force autoupdate on some WP installations.
Trough the night we got information about WP auto core update even if it was disabled on that particular site via wp-config.

define( 'automatic_updater_disabled', true );
define( 'wp_auto_update_core', false );

I am searching for common points why auto update did occur and checking which versions where present before update.

Site 1: update at 18:28 CET
Site 2 and 3: update at 03:05 CET

What might be reasons about automatic update? If there is anything particular about 6.0.1 that forces some instances to update?

Best regards.