I actually had the same experience as OP. My Easter Bunny came over time normal, maybe even a bit quicker than normal. I switched to Dark Lord to get Hari and didn't get a shard drop for about 48hours. Unlucky? maybe
+1 _shal_
devs should just change the display at award so that it is not confusing. I think that would at least alleviate some of the confusion/aggravation. It sure sounds like it feels worse to players who thought they got an event girl and then later found out it was just an avatar vs just never receiving an event girl at all in your 1800 koban roll. I would get this in the next patch asap if I were the devs...