What is removing from qbittorent? If they are removes Sonarr won’t know they are there waiting to be imported.
As long as there is a video file Sonarr doesn’t care about the promos, etc, it will just ignore them. In the case of the better version Sonarr won’t import it, in that case the workaround is to remove it from the download client or change the category (label) in the download client.
One episode not being able to import won’t prevent another download from importing, sounds like something else is the matter.
We’ll need to see ((debug logs)) that show the issue importing to troubleshoot this.