I tried this, and while 'targeted sentiment' may be neutral, 'document emotion' has Joy at 0.880435 vs the rest at 0.

If you change your example from 'I like it' to 'I like puppies', the 'targeted sentiment' changes from neutral to 'puppies positive 0.550431'.

While the first example you found does seem odd, the rest seems to work quite well. Maybe it just has problems attaching 'it' to a 'target'.