I think I solved this issue. The reason seems to be that I had the following cron related constants set in my wp-config.php file:
define( 'DISABLE_WP_CRON', false );
define( 'ALTERNATE_WP_CRON', true );
Since I am using a docker container here, I added ALTERNATE_WP_CRON and when using this we also need to set DISABLE_WP_CRON to true, otherwise all scheduled cron jobs will be run twice.
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