How to switch animation's avatar by active LOD?

Hello, Here we have a humanoid prefab with LOD Group. In LOD Group we have 3 LOD's (3 models, 3 humanoid avatars). And I have 1 animator in root prefab, which keeps LOD0's avatar by default. When LOD switches (e.g LOD0 to LOD1) my animation doesnt work (humanoid just drives when moving). I figured out how to switch avatar in runtime when LOD changes but it doesn't work (no effects). Should I refresh Animator somehow or what I should do?