Just updated to 3.3.7261. All my auto-playlists were empty.
Digging into the settings, I found the "Path has value" rule is not working, and instead just filters out everything. As I use it to keep MB from bothering with undownloaded files (some of the podcasts I listen to go back a decade or more...) I'd kinda like to have that back. Or at least a workaround.