It would be very helpful to ignore the contents of .AppleDouble/ directories in disk scans.
The problem:
Mac OS clients tend to create these directories on network drives to store metadata about files there. The metadata is stored in files named exactly like the original files. E.g. if there is a file Season01/Episode.mkv
another file named Season01/.AppleDouble/Episode.mkv
will be created. When scanning the disk for episodes nzbdrone (sonarr ) will most likely prefer the .AppleDouble/… versions for some reason so the library gets messed up.
It’s hardly possible to disable the creation of these directories when using e.g. netatalk.