Multi-extract does not behave as I'd expect it.
I have two archives in my directory.
Using the following command:
xarchiver -m * -x .
I'd expect both archives to be extracted. Only the first is.
xarchiver -m file1.zip file2.zip -x .
only extracts file1.zip
xarchiver -m file2.zip file1.zip -x .
only extracts file2.zip
This might be the reason why in thunar, when I select several archives and click on "Extract files" in the contextual menu, only the first is extracted.