I can confirm : you have found something
No more problem with r2271 !

So, I have done the clear-cache and re-run amc. Now the movie is detected as a.... serie :(
Parameter: music = n
Parameter: artwork = n
Parameter: subtitles = n
Parameter: seriesFormat = Series/{n}/{sxe} - {t}
Parameter: movieFormat = Films/{n} ({y}){'-CD'+pi}
Argument: /mnt/freebox/ext_hdd ...

I am not sure to understand, do you want I run a clear-cache, and then execute the test script again ?

The script :
def f = new File('/mnt/freebox/ext_hdd/.downloads/[www.Cpasbien] Joe.2013.LIMITED.FRENCH.720p.BluRay.x264-LOST.mkv')
def tvs = detectSeriesName(f, true, false)
def mov = detectMovie(f, false)
log.fine("$f.name [series: $tvs, movie: $mov]")
produces :
[www.Cpasbien] Joe.2013.LIMITED ...

With this line (without the prefix) : The script finds the movie !

The script :
println MediaDetection.releaseInfo.getMovieList().size()
println MediaDetection.releaseInfo.getTheTVDBIndex().size()
println WebServices.TheMovieDB.searchMovie('Joe 2013', Locale.FRENCH)
println "*****"
println WebServices.TheMovieDB.searchMovie('Joe', Locale.FRENCH)
println ...

My sysinfo log :
FileBot 4.1 (r2268)
JNA Native: 4.0.0
MediaInfo: java.lang.UnsatisfiedLinkError: Unable to load library 'mediainfo': Native library (linux-arm/libmediainfo.so) not found in resource path ([file:/home/pi/scripts/filebot/FileBot.jar])
7-Zip-JBinding: net.sf.sevenzipjbinding ...

Hello,
since 4.1, AMC don't detect my movies anymore.
For example, the following command :
./filebot.sh -script fn:amc --output /tmp --action copy -non-strict --lang fr --encoding utf8 --conflict fail "/mnt/freebox/ext_hdd/.downloads/[www.Cpasbien.pe] Joe.2013.LIMITED.FRENCH.720p.BluRay.x264-LOST ...