When a creeper with a status effect explodes, it leaves behind a lingering potion cloud of the effect it had. Regardless of what effect the creeper had applied to it, the particles emitted from the cloud are always pink, not the color of the effect it's meant to be. When you walk through the cloud, you are given the correct potion effect, it's only the color that's incorrect.

Steps to reproduce:
1. Obtain a creeper and apply a potion effect to it with a splash or lingering potion.
2. Make the creeper explode by any means. (Lighting it with a Flint and Steel is the easiest)