entity_add_item does not work

After creating an item, I right-clicked on the Triggers tab and created a procedure that triggers the item. Then, I added the code to add the item, as shown in the photo. However, I get a warning saying, "Block entity_add_item is not supported by the selected generator. It will be skipped." It doesn't work. Is there a solution?

It's fabric and version 1.21.8