[S7E5] Question regarding the medieval avengers

My original post got taken down so hopefully this one is within the guidelines.

I tried going through other posts if someone brought this up, haven't seen much luck. We know the wall has magic engraved in which prevents the dead from going through.

How will they manage to bring a wight through the wall? What about Jon and Beric who are technically undead, will they be able to get back through?

As someone mentioned on my previous post, the wight that was in castle black didn't change until he was past the wall (not 100% positive). Benjen Stark still can't get through.

Appreciate your guy's input!