It is great to see that Haaland is slowly getting back to his old form and he once again scored the can opener in this game and probably the winning goal. Haaland is still leaving out a few of his chances that he would usually convert into goals, but still he deserves to be on the pitch. It is too bad when injuries take him out. It would be sad to see this amazing player spent half of a season as a visitor in the stadium.
Yes, it was a very unexpected condition for such an excellent player to get injured. If he had not been injured at that time, then he would certainly have been much more productive. But that's all in the past and this time, he is really focused again on how to be more contributive in attacking and scoring goals. Even though there are indeed some opportunities where he is quite wasting, they may not be as effective as before. But at least, Haaland is still the top scorer that Man City relies on this season. And he keeps trying. 
OptaJoe-Haaland
Whether it was expected or unexpected is a weird statement because a player's excellence has nothing to do with his potential susceptibility to injuries. I was pointing that out because when there is a player with world class ballon d'or potential and they get stopped from performing continuously on the highest level because they miss games and can't break records for that reason, then it makes me sad.
But what I find so surprising about Haaland and his pretty extensive injury history is that he looks so extremely robust and yet he is injured relatively often. From season 21/22 until now he missed 37 games and when you check his list of injuries or the types of injuries, it's all kinds of stuff.
I hope for thim that he now stays healthy until the end of the season as he is fun to watch because he is a machine on the pitch and a down to earth player.