Unhelpful message for missing "Rendered item" configuration during indexing

Today I got this (Drupal 10.1.5 Search Api 8.x-1.30):

Workflow:
I install theme (for new node type), install module (with content for node type):
Now this is correct:
[warning] The field Rendered item (rendered_item) on index Default content index is missing view mode configuration for some datasources or bundles. Please review (and re-save) the field settings.

Then I do:
drush cex, drush cim, drush cr (workflow see https://www.drupal.org/project/search_api/issues/3393946 🐛 Highlight excerpts in frontend only works with twig files with an initial activation of option excerpt_always Closed: works as designed )

 [success] Configuration successfully exported to sites/default/files/config_sync.
sites/default/files/config_sync
 [notice] There are no changes to import.
 [warning] The field %field_label (rendered_item) on index Default content index is missing view mode configuration for some datasources or bundles. Please review (and re-save) the field settings.
 [success] Cache rebuild complete.

The string with %field_label was not solved with a value. Maybe no fallback?

Thanks @SomebodySysop. Your suggestion worked. We were seeing this error in our logs which didnt have any links so for anyone else in the same situation, these are the 2 pages to save:

/admin/config/search/search-api/index/content/fields/edit/rendered
/admin/config/search/search-api/index/content/fields

Thanks @SomebodySysop and @justclint. The TWO pages that had to be re-saved is what kept me up. I kept re-saving the "field settings" form not realizing I had to also save the "Fields" page form until I came across this issue.

For new people, you have to save again in

/admin/config/search/search-api/index/main_search_index/fields
/admin/config/search/search-api/index/main_search_index/fields/edit/rendered_item

And the error is gone if everything is configured properly, which was my case.