Not sure if this has already been reported but GDStash seems to fail to add a few illusions, at least on my end.
What I can say for sure is that it didn’t add some illusions from Kymon’s Chosen faction gear, in particular this chest piece illusion [1.1.7.2] Beginner's Scorching Ray Templar (I imported the database, added all illusions and some faction ones were missing). I also GDStashed gear from other factions and there were some previously unknown illusions.