I don't see what the issue is; God was in the form of a man when Jacob wrestled Him. Therefore, Jacob didn't see the face of God. Rather, he saw the face of a man.
In many places of Scripture, God shows Himself disguised by physical, created things (often referred to, in scripture, as the "Angel of the LORD). There was Moses and the burning bush (Exodus 3). There was the "man of God" who came before Manoah and his wife in Judges 13. As you recall, when He left, He jumped onto the burnt sacrifice they had made for the LORD, and in the flames ascended to Heaven. Interestingly (in one of the reversing of gender stereotype incidents that the Bible is known for among those who actually read it), Manoah panics, thinking they will die for having seen Him, but his wife is the voice of spiritual reason and reassures him. Similarly, in Judges 6, we have Gideon being visited by the "Angel of the LORD" as well. Here, though, it doesn't describe the angel's appearance, but we know that Gideon didn't find anything all that strange about seeing Him until He realized it was the angel of the LORD, and then feared that he would die.
In all of these cases, people see manifestations of God Himself (as evident by the Angel's speaking of God in the first person), yet do not die. Nevertheless, when they know it is God they are all frightened, and those who came after Moses usually fear that they will die, given what the LORD told Moses. But they don't die, because they don't see God's actual face. Instead, they see an angel, or a plant, or a man, or whatever else. They see God, but in a way that they can see Him without dying, without actually seeing Him (just as you might see a man in a chicken suit, but although it is a man that you are looking at, you aren't really seeing the man, but rather, the chicken suit).
This fact, that God would show Himself in created things even prior to the incarnation is actually really useful information. It helps make the incarnation make so much more sense. There is a precedent in it that comes long before New Testament times. Jews may ask us how God can be in Heaven, ruling over every subatomic particle in the universe, and yet at the same time be a man on earth (Jesus)? Well, how can God be in Heaven ruling over every subatomic particle in the universe and at the same time, take the form of a man or a plant or an angel on earth? They say that God is too great to become flesh. An yet, the Old Testament teaches He had no problem at least manifesting Himself temporarily in creation. Obviously there are important differences. The incarnation was permanent and entailed more than veiling God in created things. And yet, a lot of what seems outlandish about it already pops up in the Old Testament as well.
But Moses, in Exodus 33, is not conversing with the Angel of the LORD. He is asking to see the face of of Himself, the fullness of His shekinah glory (insofar as it can be localized). God graciously gives a glimpse of Himself as He runs by, but of courses tells Moses that nobody can see His face and live. In the future, in the new heavens and earth, this will not be the case (Revelation 22:4).
This, I believe, comes into play in explaining why the Bible in many places says that nobody has ever seen God (John 1:18; 1 Timothy 6:16; 1 John 4:12), yet we have many people seeing God. Notice in Exodus 33:20 that God equates seeing Him and seeing His face. He says “You cannot see My face, for no man can see Me and live!” No one can see Him and live? But, a few verses later, He tells Moses that He can see His back as He runs by...Contradiction! (Just kidding). It's clear from this passage that, as far as God is concerned, to "see" Him means to see His face, not just any part of Him (insofar as one could say God has parts). Well, the others, including Jacob, didn't see God's face. They saw a man, or a plant, or an angel. Moses, when speaking "face to face" (in that same chapter) clearly was not seeing God's face. If he was, why would he have then asked God to show him His face (and why did he not burst into flames)? My guess: Moses was looking heavenward, talking back and forth with God, with God responding vocally and immediately (like when talking to a person).
Whatever the case, it is as the Bible says, none of them (including Jacob) have ever "seen" God.