The LOD Cross Fade Transitioner was designed to be used with materials compatible with Unity's built in LODGroup, and used the same shader magic that component uses to transition materials.
With Update 1.4.0, this functionality has been rolled into the existing Mat Prop Block Transitioner and Per Material Transitioner components. All you need to do is enable the 'Use Unity Crossfade' on these components setting and then make sure any LOD Groups making use of the transitioners are configured to have their Visible State Of Stored Assets When Active setting set to Invisible (this setting can be found on your Streamable Grid assets).