Download filename corrupt with a space in the file name

File names from downloads are incorrect if the file name has a space in it. For example:
"test_1234.zip", when downloaded results in "test_1234.zip"
where
"test 1234.zip", when downloaded results in "test"

This does not seem to depend on the file type, as I've tried it on .zip, .pdf and .tar.gz files.