Summons have never triggered traps for me, and I've played through quite a few times. I live with it, and always have a thief who has great trap spotting skills at the head of a party when I move into new areas. In fact, I frequently have a thief in hiding (or better still, with invisibility going), accompanied by several summoned creatures, scouting ahead. If something nasty turns up, my thief moves back, but keeps the creatures in view as they fight, while the rest of my party moves closer.
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