Misleading error message

Two depending parts already cleaned but the same error message appeared.

ubuntu@my-snapcraft-playground:~/mp3splt-snap$ snapcraft
Skipping pull ccache (already ran)
Skipping build ccache (already ran)
Skipping stage ccache (already ran)
Skipping prime ccache (already ran)
Skipping pull automake-legacy (already ran)
Skipping build automake-legacy (already ran)
Skipping stage automake-legacy (already ran)
Skipping prime automake-legacy (already ran)
Skipping pull desktop-gtk3 (already ran)
Skipping build desktop-gtk3 (already ran)
Skipping stage desktop-gtk3 (already ran)
Skipping prime desktop-gtk3 (already ran)
Skipping pull libmp3splt (already ran)
Skipping build libmp3splt (already ran)
Failed to reuse files from previous build: The 'stage' step of 'libmp3splt' is out of date:                                                                   
The 'stage' step for 'libmp3splt' needs to be run again, but 'mp3splt' and 'mp3splt-gtk' depend on it.                                                        
To continue, clean that part's 'stage' step, run `snapcraft clean mp3splt mp3splt-gtk -s stage`.                                                              
ubuntu@my-snapcraft-playground:~/mp3splt-snap$ snapcraft clean mp3splt mp3splt-gtk -s stage
Skipping cleaning priming area for mp3splt (already clean)
Skipping cleaning staging area for mp3splt (already clean)
Skipping cleaning priming area for mp3splt-gtk (already clean)
Skipping cleaning staging area for mp3splt-gtk (already clean)
ubuntu@my-snapcraft-playground:~/mp3splt-snap$ snapcraft
Skipping pull automake-legacy (already ran)
Skipping build automake-legacy (already ran)
Skipping stage automake-legacy (already ran)
Skipping prime automake-legacy (already ran)
Skipping pull ccache (already ran)
Skipping build ccache (already ran)
Skipping stage ccache (already ran)
Skipping prime ccache (already ran)
Skipping pull desktop-gtk3 (already ran)
Skipping build desktop-gtk3 (already ran)
Skipping stage desktop-gtk3 (already ran)
Skipping prime desktop-gtk3 (already ran)
Skipping pull libmp3splt (already ran)
Skipping build libmp3splt (already ran)
Failed to reuse files from previous build: The 'stage' step of 'libmp3splt' is out of date:
The 'stage' step for 'libmp3splt' needs to be run again, but 'mp3splt' and 'mp3splt-gtk' depend on it.
To continue, clean that part's 'stage' step, run `snapcraft clean mp3splt mp3splt-gtk -s stage`.