I was creating a quest in 2.50.2 and part of it included a bomb lweapon produced by script. However, for some reason it wasn't setting off the onscreen flag for Bomb (Any). Here's a link to a copy of the quest.
https://www.dropbox.com/s/0hlebo9cx7...nsbug.qst?dl=0
The item which gives the bomb ability is a bomb, but you must also have the item labeled morph ball to use it. The screen where this occurred was on map 2, number 55.