Hints are no longer being included when a CSV vocabulary is imported. I’ve tried it with many different files, finally reducing it to this simple two-line ascii character file, which you can use to reproduce the error. Try importing a file with these contents (UTF-8, Unix line breaks):
abcde, fghij, klmno
The result is:
abcde f klmno
aaaaa d eeeee
It seems that it is truncating the hint. It also seems that its a new bug, since I have successfully imported such files before.
Is there any workaround for this problem?