New pinch & zoom issues with Ventura 13.5.1
I have two identical 13" MBA M2's. One running 13.4, the other 13.5.1. The 13.5.1 one had a bug where pinch & zoom only responds maybe 80% of the time. 20% of the time it just misses the gesture and you have to repeat it. The 13.4 one did not have the bug. I just updated the 13.4 one to 13.5.1 as well and now it does. So this seems to be a fresh bug in 13.5.1. If anyone else is encountering it, please leave a bug report with Apple so they are aware of the issue and can fix it in the next update: Apple feedback
More info: Issue persists after toggling pinch & zoom on/off in System settings, after restart, in safe mode, and in a fresh user account. It occurs with both the built-in trackpad and an external trackpad (Magic Trackpad). It occurs with bluetooth on or off. It occurs in native apps including Keynote, Safari, Pages (haven't tested Chrome). One fix of a similar issue in the past has been "killall Dock" in Terminal--this has no effect.
MacBook Air (M2, 2023)