Undefined array key "search_similar_tags"

When adding a node that has entity reference (Taxonomy) fields which use the ai_interpolator_openai, this warning appear:

Warning: Undefined array key "search_similar_tags" in Drupal\ai_interpolator_openai\Plugin\AiInterPolatorFieldRules\OpenAiTaxonomy->generate() (line 168 of modules/contrib/ai_interpolator_openai/src/Plugin/AiInterpolatorFieldRules/OpenAiTaxonomy.php).

Proposed resolution

Add checking if these array keys are defined.