A very funny bug in Amnesia.

[Zaffre]

1. The tank has acid in it.
2. It bounces out of the tank.

Well, given that glass does not react to acid, and that the bottle is enclosed, I don't find it so strange. The bounces are a bit buggy (indeed), but I don't find the simple fact there are bounces any strange.

The bottle may be buoyant but it wouldn't fly up into the air over and over, especially when it lacks the momentum. It wasn't thrown in at high speeds; it was gently dropped in.