I have a Drupal 6 site, with some fields that allow you to pick from a list of allowed values. These values are then stored/linked to the node/entity. After migrating from the old site, these values are still stored/linked to the node/entity, but the field itself does not have a list of allowed values. So if I edit a node that has this field, I can't pick anything from the list.
I can re-create the list of values (which get keys automatically generated to be the same as the values) but that seems like the wrong thing to do. Does anyone know how I can simply migrate the existing list into Drupal 8 properly, or where these key/value pairs are stored so I can just create some SQL scripts to populate them instead?