Incorrect smoke animation

[Machinocheese]

Bug Summary

The smoke animation, or the animation that plays whenever a Pokeball is opened, seems to be off. More specifically, there seems to be some unwanted residue left behind in the center of the animation.
Here's an example. It currently looks like:

while it should look like:

I'm also decently positive this issue persists through the entire animation, not just at that particular instance. Here's another example:

Steps to Reproduce

Try entering a battle and observing the smoke animation as the Pokemon enters the battle.