Animated cross fade on LODGroups doesn't work with GPU Resident Drawer

Steps to reproduce:

0. Ensure GRD is enabled

1. Create a scene with LOD Group and two LOD levels

2. Enable cross fading and check the Animated cross fading option

3. Move the camera to transition in between LODs

Actual results: 

The LOD levels change abruptly

LODGroup.crossFadeAnimationDuration is not taken into account https://docs.unity3d.com/ScriptReference/LODGroup-crossFadeAnimationDuration.html

Expected results: 

The object is excluded from the GRD path and thus:

An animated cross fade between the two LODs should be triggered when crossing the distance threshold between the two LODs.

LODGroup.crossFadeAnimationDuration is taken into account

Reproducible with versions: 6000.0, 6000.1

Not reproducible with versions: 

Can't test with versions: 

Tested on (OS): Windows