Another stupid grammar lesson
When Duolingo tried to tell me that "I enjoy this beer since yesterday" was grammatical English, I put in a complaint. I thought maybe they would try to fix their errant computer translator. Well, instead they sent me a note from an actual human, who asserted that the sentence in question made sense. It doesn't of course, though I suppose the problem is actually at the semantic level. Because "since", when applied to time, refers to a period that started in the past and ends in the present, it needs the present perfect tense.
Unfortunately I couldn't complain to the author at her donotreply address.