**System Information**
Operating system: Win 10 Pro / Version: 10.0.19043 Build 19043
Graphics card: Nvidia 3080Ti / Driver Ver: 511.79
**Blender Version**
Broken: 3.1.0 Stable & 3.2 master.f6b73966101d
Geometry Nodes -> Merge By Distance Node breaks motion blur in Cycles. Works fine in EV.
**Exact steps for others to reproduce the error**
1: Take a mesh, split edges,
2. Set Position to give faces motion along their normal vector,
3. Extrude Mesh by faces,
4. Join Geometry with original faces,
5. Merge By Distance
6. Render in cycles with Motion Blur, Mesh Explodes. Now Remove Merge By Distance and render again.
{F12927715}
{F12927717}