LDD Seems to be missing a piece So I'm trying to make an alternate version of the UCS Tie Fighter.  I'm following the official instructions downloaded from the LEGO site, and I've come in to a problem.  This piece, seen here (ID: 6089147 from the piece list) is missing from the LDD parts:




Now, I'm not sure if this is the best place to mention this, but well... there it is.
If it's in some weird place that I haven't looked it would be great if someone could point me in the right direction, but as it stands I'm pretty sure it just isn't in the list.  How would one go about telling the big wigs about this?
18677 IS in latest LDD update (mid march 2016), issued after announcement of LDD end of support... Just make sure to be in LDD Extended mode to find it, along with other plates.