From the pictures, the top lid label stating pesto was correct, but the tubs pre-printed container label states hummus. So someone put the wrong preprinted tubs into the filler. An Allergen Preventive Control would include ensuring both the lid and container are in agreement with the product being packed.
https://www.fda.gov/safety/recalls-market-withdrawals-safety-alerts/bakkavor-usa-issues-allergy-alert-undeclared-milk-and-walnuts-trader-joes-genova-pesto
Bakkavor USA Issues Allergy Alert on Undeclared Milk and Walnuts in Trader Joe’s Genova Pesto
Summary
Company Announcement Date: May 04, 2023
FDA Publish Date: May 09, 2023
Product Type: Food & Beverages
Reason for Announcement: Product may contain undeclared milk and walnuts
Company Name: Bakkavor USA
Brand Name: Trader Joe’s
Product Description: Genova Pesto Packaged in Tubs Marked Hummus Dip
https://www.fda.gov/safety/recalls-market-withdrawals-safety-alerts/bakkavor-usa-issues-allergy-alert-undeclared-milk-and-walnuts-trader-joes-genova-pesto
Bakkavor USA Issues Allergy Alert on Undeclared Milk and Walnuts in Trader Joe’s Genova Pesto
Summary
Company Announcement Date: May 04, 2023
FDA Publish Date: May 09, 2023
Product Type: Food & Beverages
Reason for Announcement: Product may contain undeclared milk and walnuts
Company Name: Bakkavor USA
Brand Name: Trader Joe’s
Product Description: Genova Pesto Packaged in Tubs Marked Hummus Dip