**System Information**
Operating system: Windows 10 Pro 64-bit
Graphics card: NVIDIA GeForce RTX 2080 Ti
**Blender Version**
Broken: Blender 2.81 Alpha, September 18, 14:29:45 - b962aca8003d
Worked: 2.80
**Short description of error**
Vertex Paint ➔ Paint menu ➔ Smooth Vertex Colors tool is broken.
**Exact steps for others to reproduce the error**
1. Divide the default cube a few times (apply if subdivision is done with modifier).
2. Enter Vertex Paint mode.
3: Paint an area with black.
4. Apply Paint menu ➔ Smooth Vertex Colors.
5. The vertex paint is not smoothed.