Never had such an issue. I'll try to reproduce it.
But the script worked in general?
Edit: I'm testing with your mod now, and trying to reproduce this.
Beside a possible problem with item movement, maybe there's a particular issue with this gate. The first things that come to my mind are the auto-save (had Elric triggered it already?) and the open/close door mechanic in Osiris which isn't triggered when the Guard is in combat or dead but, as far as I see, the dialog will be triggered when the door is locked - was it locked?
Last edited by Abraxas*; 23/02/17 10:27 AM.