I got it, for some stupid reason the stones I had in my inventory after disarming the enemy traps were used first, after them the ext item was used.Does "Create trap" with "Ext1/2" item work? Skill says that the ext item will be used, but the trap is created using stone whether I hold shift key or not. I put the "Full Metal Harness" in "EXT-1" slot, I even checked it by using the skill "Use EXT-1" and it was used, but the trap does ignore any item put in that slot. Am I doing it wrong or is there a bug? I used the search function in this thread and everything seems to work for other people as expected.
Is there a way to use ext item first?