Static Mesh Decals flicker when ISM components with same material are in frame

When using a Deferred Decal material on an assets with ISM Runtime Cell Transformers, flickering occurs when static mesh and instanced static mesh components are in the frame using the same decal material instance.

• Flickering occurs whenever an ISM component and a SM component of the same deferred decal Material Instance are both within frustum

• Only the SM component will flicker

• This can be observed in editor, PIE and package

• The issue can be introduced by ISM transformer, or by manually creating ISMs

This issue is because the commands get cached and the following will prevent that:

1. Set a Translucent Sort Priority on the SM components
2. Set r.MeshDrawCommands.UseCachedCommands=0

1. Create a Material using Deferred Decal
2. Place several Shape > Cube actors into the scene and set their material to the above
3. Use Actor > Merge Actors > Batch to convert some of them to ISM

Observe flickering on the ones you have not merged, whenever the ISM is also within frustum