Was successfully using iPod classic on Catalina syncing to podcasts app. Finder window for syncing this device appears when it is plugged in. I select sync all episodes of all podcasts.
Upgraded to Big Sur. When I plug in this device, which had working podcasts, I see no podcasts listed in the window - I changed to sync all episodes of selected podcasts, which used to make the list of podcasts appear. I carelessly didn't look the first time I plugged it in and selected all episodes of all podcasts, which wiped my iPod clean of podcasts. I do have many subscriptions, they are all there and appear to all be playable from my MacBook Pro. Running latest available Big Sur update and version 1.1.0 of Podcasts.
Upgraded to Big Sur. When I plug in this device, which had working podcasts, I see no podcasts listed in the window - I changed to sync all episodes of selected podcasts, which used to make the list of podcasts appear. I carelessly didn't look the first time I plugged it in and selected all episodes of all podcasts, which wiped my iPod clean of podcasts. I do have many subscriptions, they are all there and appear to all be playable from my MacBook Pro. Running latest available Big Sur update and version 1.1.0 of Podcasts.