Importing appears to work but none of the redirects actually work

I imported a file in the format:
From URL,To URL,Redirect Status, Redirect Language
foo,bar,301,

The import said it went well, they appeared in my list. However, if I clicked on any of them, I would only get 404's.

I removed the Redirect Status and Redirect Language columns and their content and the import worked, and the redirects worked.

I am not sure what went wrong with it, but hopefully this helps other people using the module import their redirects and perhaps someone can fix this bug.