Yes I have had the same probably as of tonight and the previous lost sector that was meant to be dropping new leg exotics but only got exotics helmets from the last lost sector, and this lost sector I can't anything to drop and now the new lost sector for dropping the new exotics legs is giving me the error code "Beet".....???
If the exotic engram from a Legend Lost Sector is sent to your Postmaster because your engram inventory is full, you are not guaranteed to receive an exotic drop in the advertised armor slot.