MillionDance fails to load recent head/body Unity3d files

[KimL-IVA]

Recently (probably since April), MLTD has been upgraded Unity version from 2018.4.12fl to 2020.3.28fl.

And MillionDance causes errors when I try to make a model from new head/body unity3d files.

Below is a error log from when I tried to make a model from 'ch_ss007_015siz.unity3d' and 'cb_ex022_a.unity3d'

"""
Worker started.
Loading body avatar...
Loading body object hierarchies...
Loading body mesh...
Loading head avatar...
Loading head object hierarchies...
Loading head mesh...
Error occurred.
System.Collections.Generic.KeyNotFoundException: Found no SkinnedMeshRenderer associated with this mesh (eyes).
at AssetStudio.Extended.CompositeModels.MeshWrapper.FindMaterialInfo(SerializedObjectsLookup serializedObjectsLookup, Mesh mesh, Int32 meshIndex, TexturedMaterialExtraProperties extraProperties) in C:\projects\mltdtools\src\AssetStudio.Extended.CompositeModels\MeshWrapper.cs:line 189
at AssetStudio.Extended.CompositeModels.MeshWrapper..ctor(SerializedObjectsLookup serializedObjectsLookup, Mesh mesh, TexturedMaterialExtraProperties extraMaterialProperties) in C:\projects\mltdtools\src\AssetStudio.Extended.CompositeModels\MeshWrapper.cs:line 19
at OpenMLTD.MillionDance.Core.IO.ResourceLoader.LoadHeadMesh(String filePath) in C:\projects\mltdtools\src\MillionDance\Core\IO\ResourceLoader.cs:line 103
at OpenMLTD.MillionDance.MainWorker.DoWorkInternal(Object state) in C:\projects\mltdtools\src\MillionDance\MainWorker.cs:line 117
at OpenMLTD.MillionDance.MainWorker.DoWork(Object state) in C:\projects\mltdtools\src\MillionDance\MainWorker.cs:line 48
"""

And I found some differences between new unity3d files and old ones.

'm_RayTracingMode', 'm_RayTracinProcedural', 'm_BonesAABB', 'm_VariableBoneCountWeights' etc...

But I've no idea what makes these errors 'cause I'm not really good at these things. :(