Sonarr auto deleting episodes and replacing with one incorrectly named season file

Sonarr version (exact version): 3.0.4.1021
Mono version (if Sonarr is not running on Windows): 6.12.0.107
OS: Ubuntu, Focal Fossa
Debug logs: https://pastebin.com/6kLU1Ep3
Description of issue:
I have Sonarr connected to Deluge. Tell it to download a full series, it goes out and downloads perfectly fine. When the download finishes, Sonarr will import only a single file from the season pack. Example . The season pack is downloaded in full.

If I copy all the files from the fully downloaded season pack and manually put them in the correct Season folder, and click the “Refresh & Scan” button for the series – it goes through and deletes every episode, and replaces it with the single, incorrectly named one season file.

The debug logs are incredulously long, so I grabbed the one that used the season I was messing with: S03.

What am I doing wrong, or how can I get Sonarr to import the season files separately/correctly?

  1. Upgrade Sonarr there was a fix in this area recently
  2. Instead of disabling rename you can use Original Filename in the rename pattern