Question Blend tree animations do not work on LOD group

Hello everyone! does someone faced that BLEND TREE´s animations are not updated in a LOD group set for an animated character?

• I am using Unity 2019.4.30.
• I have a character animated with a biped in 3Ds Max;
• I have4 LOD versions of the model that use the same biped and animations.
• I exported them to Unity and set as generic in the inspector.
  
• I created an empty object with the LOD group compenent. I added to it the different LOD versions of the character;
• Each LOD version has a the animator component.
• They share the same avatar and the same animation controller.
• I´ve set the same root bone of the LOD models: the bone from the LOD 0 model.
• Animator controller: Animation states and their blend trees are set in the same base layer: Blending Override + IK Pass

However it does not work for animations set within the blend tree.
I´ve checked LOD models inside the group only update animations between animations states. But if I modify a float, say 'Forward', within the Blend Tree, only animations are updated at LOD 0 model, but the rest of model keep playing the default animation set in the blend tree.

Any help to fix it or a workaround?
Thank you in advance!

PD: The only workaround I can thnk about right now is to set an animation controller without blend trees, but with states only.