"Clock widget not updating/time incorrect compared to clock app icon (whilst much better than B4, clocks still go out of sync after a while)"
Widgets not updating and being out of sync with reality has been a problem ever since widgets were first introduced. Hopefully now that they're more front and center they're finally going to fix this issue.
It's especially frustrating for the Weather widget. It would update about half the time, so I ended up removing it, since having no weather information is far better than wrong information.