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I have followed this instructions

How to add more custom field in Linked Product of Woocommerce

and this

Add a custom multi-select field to admin product options settings in Woocommerce

to add a new selectbox to linked products and show selected products in frontend. Instead of something like are upsells with images/prices, I'm getting in both cases string "Array" on frontend:

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EDIT: no any hints or help?

Juraj
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