V3.0 - Unzip zipped DMG and move DMG to folder

I've just tried to setup a rule as follows:
If Full Name ends with .dmg.zip
Unarchive
Move to folder "DMGs"
However, it doesn't work. A Growl message says it couldn't unarchive the zip, and the Console gets updated every second with:
2012-03-01 23:21:10.488 hazelworker[11705] gruml.dmg.zip: Rule Zipped DMG matched.
2012-03-01 23:21:11.158 hazelworker[11705] Unsupported archive type: 6
2012-03-01 23:21:11.159 hazelworker[11705] [Error] Unarchive failed: Failed to unpack archive for /Volumes/Stuff/Downloads/gruml.dmg.zip.
for every .zipped DMG file in my Downloads folder.
If I try to use the system unarchiver by just opening file zipped DMG, Hazel moves the file before it's finished unzipping it. The files unzip just fine if double-clicked in the Finder.
What am I doing wrong?
If Full Name ends with .dmg.zip
Unarchive
Move to folder "DMGs"
However, it doesn't work. A Growl message says it couldn't unarchive the zip, and the Console gets updated every second with:
2012-03-01 23:21:10.488 hazelworker[11705] gruml.dmg.zip: Rule Zipped DMG matched.
2012-03-01 23:21:11.158 hazelworker[11705] Unsupported archive type: 6
2012-03-01 23:21:11.159 hazelworker[11705] [Error] Unarchive failed: Failed to unpack archive for /Volumes/Stuff/Downloads/gruml.dmg.zip.
for every .zipped DMG file in my Downloads folder.
If I try to use the system unarchiver by just opening file zipped DMG, Hazel moves the file before it's finished unzipping it. The files unzip just fine if double-clicked in the Finder.
What am I doing wrong?