Apparently the installer creates empty directories for each path listed in debian/smc-data.dirs and copies the files listed in debian/smc-data.install to their respective directories.
usr/share/games/smc/campaign is missing from both files and that can be the origin of this bug.
The 'campaign' folder is missing in the file debian/ smc-data. install too:
debian/ tmp/usr/ share/games/ smc/editor/ * usr/share/ games/smc/ editor tmp/usr/ share/games/ smc/gui/ * usr/share/ games/smc/ gui tmp/usr/ share/games/ smc/icon/ * usr/share/ games/smc/ icon tmp/usr/ share/games/ smc/levels/ * usr/share/ games/smc/ levels tmp/usr/ share/games/ smc/pixmaps/ * usr/share/ games/smc/ pixmaps tmp/usr/ share/games/ smc/schema/ * usr/share/ games/smc/ schema tmp/usr/ share/games/ smc/sounds/ * usr/share/ games/smc/ sounds tmp/usr/ share/games/ smc/world/ * usr/share/ games/smc/ world tmp/usr/ share/games/ smc/translation s/* usr/share/ games/smc/ translations
debian/
debian/
debian/
debian/
debian/
debian/
debian/
debian/
Apparently the installer creates empty directories for each path listed in debian/ smc-data. dirs and copies the files listed in debian/ smc-data. install to their respective directories.
usr/share/ games/smc/ campaign is missing from both files and that can be the origin of this bug.