Upload a model with: * 3 materials A, B, C in the highest LOD * 2 Materials A, B in a lower LOD Error occurs. This was an error in the SL viewer for many years. The server permits fewer materials in lower LOD levels as long as every material is found in the highest LOD. This intentional feature (been there since Mesh went live) permits better optimization of low LOD mesh. This error was already fixed. This is a regression. See: https://github.com/secondlife/viewer/issues/1529 Issue passed QA in 7.1.9.9469671545
