Background--Apple totally changed how Podcasts are handed in the most recent version of macOS. Not only do they have their own app, but they are now stored in a temporary and hidden cache file rather than in the main file system with music.
For me, at least, this has totally messed up how podcasts are syncing with my 645M. They now show up on the watch with a random 4-digit hexadecimal name (which I'm guessing is the name of the temporary file each episode is saved as). The result is that podcasts are no longer sorted into subfolders for each show, and you can't see titles when browsing on the watch. The weird thing is that if you select a file, you can see the show/episode name.
Is anyone else seeing this? Has anyone found a workaround?