Have you found the Time Travel bug? If you have a World Clock as a complication and travel to between midnight and 1AM in that timezone it shows up all sorts of impossible times like 0:89. I reported it ages ago, only just been marked as a duplicate of an open report.
I honestly haven't even attempted that. I typically don't have those set as complications plus I've left Time Travel off because I always inadvertently hit it. My only complaint about watchOS 3 is weather app. Scrolling changes the city and doesn't show 10 day forecast. You have to tap the enter of the screen to get that. You no longer get hourly forecast or rain % chance. You only get hourly conditions. This might be the only reason I turn time travel back on because if you have the weather complication and time travel, it shows you the hourly temp again.