Solved config issue
In a fresh installed WP-Unmanaged app: in (https://cloudron.io/documentation/apps/wordpress-unmanaged/#cron-tasks) it's written that WP-cron is disabled but it's not, I had to manually add
@imc67 Indeed, the docs are incorrect. I have fixed this. I guess it got copy/pasted from the managed wp docs.
I had similar problem, not with DISABLE_WP_CRON but with
define( ‘WP_POST_REVISIONS’, false );
It seems putting that command inside wp-confing.php it does not make any change on behavior...