Only the first line from a workflow that produces multiline output is displayed in the notification centre, this differs from the v1 behaviour.
Steps to reproduce:
Create a new workflow using the template "Templates > Essentials > Keyword to Script to Notification" Double-click on the keyword step and enter a keyword, select "No argument" and click "save". Double-click on the "Run script" step and enter in the script text field: echo -e "this\nthat", click "save"
Now run the workflow, the expected output in the notification centre should be:
this
that
The actual output is:
this
OSX 10.8.3
Alfred: 2.0.2 build 178