Hi, I'm from Israel and I used to come here in the last few months and read your comments after every game (I use google translate on the page). Besides chats about Hummus or about him being jewish, it seems like you're not sure what Zahavi's status and maybe I can be useful.
Zahavi brought a lot of expectations and it's reasonable to expect him to score every game, more than one goal, but from knowing Zahavi's history It's pretty obvious what is the problem right now. Zahavi's best qualities are his movement without the ball and kicking to the net. that's what you should expect from him, but I've seen your team lately and correct me if I'm wrong but it seems like many players are losing the ball so many times and the passes are not accurate at all. there are not enough chances so Zahavi feels the need to fall back more and more and then it's not optimal for him to do what he usually does on the front.
Another thing is the lack of chimestry. In Israel, Zahavi worked with wings that understood the way he plays. they knew how "he likes" the ball. in China, he had teammates that saw him as a leader (unlike in PSV where he seems a stranger) he even got another player from Israel along his side in China and it proved itself. my opinion is that his teammates at PSV are not realizing that or don't even care and they are not trying to adapt to his style. on the other hand, Zahavi's trying to adapt to their style isn't successful. that's something the manager (who knows Zahavi) must fix, but the players should try to accept him too.
Maybe the fact that he barely had training with them in a row had an impact, and it will be better in the next few games, but it's also possible that Zahavi is not suitable for PSV, but until those points will be fixed, it's really not the time to judge.
Sorry for the long comment. have a great day and good luck.
Edit:
Take a look for example at his Hat trick against Austria last year. 2 of the goals' assists were made by Eli Dasa from Vitesse