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Hello @Luca_Lattarini,
preview will fail every time you use anything more than variables. try to send yourself a proof and if it works it works.
Also mind that doing query in personalization will cause decrease in delivery processing speed. As you query database for each recipients.
It Would be better to append this article before delivery to the targeting dimension or even better if same article is used for more recipients inject the article array as json string to the delivery from the delivery object modification script and then use it as variable?
Follow this article:
https://blog.floriancourgey.com/2018/05/how-to-add-variables-from-a-workflow-in-a-delivery
How to add variables to delivery find here