Hey @mszal_ib! I confirm I could reproduce an issue in 8.14 and it seems that we have a bug here. We will address it.
For now you can use following steps to clean up you crawler overview page
Step 1: list your crawlers
GET _connector?service_type=elastic-crawler
Take the id from the response use to delete crawlers without index names:
DELETE _connector/{id}
Let me know if it fixes your issue.