The team has reproduced this and opened bug for fix. Updates will be shared on this post. Sincere apologies for any inconvenience.
Adobe XDAnna commented
Zooming in/out doesn't work for me either. At all.
I've tried both zooming normally (ie pressing Z and then just clicking with the mouse) as well as the keyboard shortcuts (both on the laptop's own keyboard, as well as my external keyboard.)
The only thing that works is View -> Zoom to Selection, Fit all, etc. (The keyboard shortcuts for those work too.)
Pretty annoying to not have this basic functionality...
Macbook Pro, running Mojave 10.14.6
Adobe XD version 22.214.171.124