After the last update dupes sometimes get stuck in absolutely incredible places. I've played for about 3 hours and this is the second incident for this time. This has never happened before. I've attached a screenshot and savefile made right at the scene. Look at Olive, how did she even got there? Now she lacks oxygen and twitches so funny, Awwww.
It seems that it happens when dupes are building tiles over the chunks at the moment when the chunk is being excavated, but that's not for shure