Argument #1 ($entity) must be of type Drupal\autotagger_search_in_text\Plugin\Autotagger\ContentEntityInterface

@brooke_heaton , i have fixed the issue and crated patch.

Can we use MRs going forward?

I think this patch applies in an old version of the module before the stable release.
Could you check if the error still exists with current release?
I could not reproduce.