Steps to reproduce
1. Load the current B-B save.
2. Jump to (857,622).
3. Wait until the oil rig is producing crude oil.
Expected results
A gas flare (https://en.wikipedia.org/wiki/Gas_flare) appears at the top of the oil rig's flare stack.
Actual results
The flare appears a couple of tiles to the right of the flare stack:
Oil Rig Animation Bug.gif
I am not sure exactly what the misalignment is.
Alignment of the smoke graphics is not a straightforward thing. Vladki was working on a patch for this some years ago, but sadly it was never finished.