I can't seem to find anything about this in Bugs/Suggestions.
MM2BUB has 2 places where you'll die by falling even though they're not a pit. Indicated by the Shadowman logs in the images below.
(http://zupimages.net/up/17/11/257a.png)
(http://zupimages.net/up/17/11/s072.png)
There's a little probability there's more of these.