If there are multiple patterns defined in "move additional files" that will match the same file, saving will fail. The reason is that the first pattern already moves the file, and the second pattern tries to move the same file again.

Traceback (most recent call last):
File "/home/phw/devel/musicbrainz/picard/picard/util/thread.py", line 52, in run
result = self.func()
File "/home/phw/devel/musicbrainz/picard/picard/file.py", line 231, in _save_and_rename
self._move_additional_files(old_filename, new_filename)
File "/home/phw/devel/musicbrainz/picard/picard/file.py", line 452, in _move_additional_files
shutil.move(old_file, new_file)
File "/usr/lib/python3.7/shutil.py", line 571, in move
copy_function(src, real_dst)
File "/usr/lib/python3.7/shutil.py", line 257, in copy2
copyfile(src, dst, follow_symlinks=follow_symlinks)
File "/usr/lib/python3.7/shutil.py", line 120, in copyfile
with open(src, 'rb') as fsrc:
FileNotFoundError: [Errno 2] No such file or directory: '/home/phw/Musik/Tagged/lossless/P/Parasite Inc_/Dead and Alive_org (Kopie)/Dead and Alive.pdf'