Hernmont in Lower sells svirfneblin disrupter and oil bottle bomb. The description of both items tell their function, but the item special properties list simply: 'choking power - single use".

Is it a bug? Are these items working as their detailed descriptions says?

From testing them, they indeed have very different effects.

They're scripted to use the same script as choking powder, but they have different effects.

Yeah, what they said. :)