double files after beet fingerprint

[Crednam]

hello, I allways get double audio files like

01 Aces High.1.flac
01 Aces High.flac

when I import a new album with fingerprint.
thats my config.yaml:

plugins: chroma fetchart duplicates
directory: /media/data/@musik

acoustid:
  apikey:  foobarbaz

I have often done these things manually:

beet update
beet dub -d
beet fetchart
beet fingerprint
beet submit
beet write

With a beet ls the duplicate files with a ".1" at the end are not listed, so they are not removed with beet dub -d either.
Is there any way to either not create these files in the first place or make them invisible to other programmes like mpd?