Open Sesame Opportunity Bug in Hitman Marrakesh?

So, being partial to a trophy or two and enjoying the way that opportunities in Hitman allow one to experience vey different approaches to achieving the same goal, I was hoping to continue to complete all opportunities in Marrakesh.

However, this particular opportunity seems bugged - details being that having stolen a key, the next instruction is to open a door into the school; having done this,now on numerous disguises, the opportunity always goes straight to 'missed' and 'objective surpassed'. This is driving me a LITTLE BIT CRAZY.

Has any one else encountered this issue and is there any word on a forthcoming fix?

Yep, have the same issue here and I'm on Xbox. It's the last achievement I need so it's a tad frustrating. I've looked around a little and apparently it's a known bug by IO so hopefully we get a fix in the next patch.