Just like the “vlookupChildAddedCallback” method, does exist a method that is triggered after a record has been deleted from the list, for example in a relationship between “parent-child” in which the child item is deleted.
I need this method to fill in another field.
Sorry, but because this is client side I cannot detect deleting of items – if you are on SharePoint online you can use the “When an item is deleted” trigger in Power Automate.