Honestly wondering if he's not rounding the keeper because he's fearing missing the open goal after it. There's got to be some reason he's not doing it though, maybe he's so stubborn with how he wants to score that he's sick of messing the one on ones up and he's trying to score a bunch instead but he's not focusing and placing his shots. I've read that some idiots have been sending him threatening messages which could be why he's deleted all his instagram posts, it seems like a drastic move though instead of blocking/reporting them instead. Maybe he's sick of how things are going and really wants out.
It's also weird how things alternate with him and Gakpo. One of them plays and will usually get a goal here and there and be seen as ok while the other is subbed on in later stages of games and gets stick if they're not instantly playing well. Gakpo was getting shit for it not long back, now it's Nunez again. I don't think either of them are the super sub type player and both need regular games.
I've thought for a while now though that Gakpo seems more suited. he might not get as many goals or assists as Nunez would on top form but he seems to fit into the team better and could be more consistent over time. And he now has the advantage of Slot arriving so maybe that's also on the mind of Nunez.