Titles sent to downloader, but not tracked in Activity/Queue

Sonarr version (4.0.5.1710):
Mono version (if Sonarr is not running on Windows):
OS: macOS 14.5
Debug logs: Sonarr only offers “Log Files” and “Updater Log Files”; most-recent log file is here: Sonarr — A Man and His Beans
Description of issue: Many series & episodes, when beginning a search (whether series-wide, season-wide, or individual episodes), Sonarr’ll find a file and pass it along to the downloader, but then doesn’t track or follow it in the Activity/Queue view. However, this doesn’t happen with all titles, and it doesn’t happen all the time: I just pushed through a series where Sonarr didn’t track 95% of the episodes it passed along to the downloader, but did keep/follow/retry a couple of them. It also just leaves all the failed files in the download client. I’m running the newest version of the software hoping that would help, to no avail.

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This was due to the user not using categories, but the default categories in SABnzbd automatically being assigned.