It has been 1 day since I updated to Nothing OS 3.0 and have not noticed any major issues with it.
Few things:
I am not sure if this is intentional or not but the 3 dot menu in the app drawer directly opens the drawer settings page.
Normally the 3 dot menu icon is associated with a sub list and if a new page needs to open, it would be good if the icon changes to something else like a gear icon.
Attached video for the same.
Second is there is no way to collapse the expanded volume menu. There is no back icon in the expanded volume menu to go back to the original size.

Video: