A chaotic encounter saw United take 30 shots at Martin Dubravka's goal, with one disallowed, two cleared off the line and another two striking the woodwork.
But it was the Slovenian who made the pressure count, first in the 50th minute turning home a Bruno Fernandes through-ball with a wicked first-time finish, and then putting the Reds ahead with another well-placed strike from a Patrick Chinazaekpere Dorgu cross.
Given the pressure Darren Fletcher's side were applying, it looked like being enough to secure the win and potentially creating a platform to score more. Unfortunately, that wasn't to be, as Jaidon Anthony found a leveller at the other end a few minutes later.