Is it possible for the minion trap and spray not to work? I thought it was every time but just got an event and they got away with the item.

Do you have both in your inventory? I think I've heard in the past that it's still not 100% chance, but I've never actually heard from anyone who missed an item with both before

Yes, both are locked into my inventory. I'm 99% sure I've never had this issue and was trying to see if it's a glitch.

Sounds like a glitch to me.

It was indeed true way back years and years ago that if you had both there still was a chance to miss. But this has not happened to me in years.