“Train as Good” doesn't move messages to inbox on Monterey

Im having the same issue as the OP after upgrading to a new MBP and Monteray 12.0.1 (and manually copying across the Spamsieve data folder/prefs) - all seems fine but Train as Good doesnt move the emails out of the spam folder.

Tried the steps to Change Spamsieve settings via the Apple Mail Messages menu to no avail.

Please try updating to SpamSieve 2.9.47b1.

Thanks Michael! That did the trick.