[Shading] Strange normal at UV seams

[roeas]

Modole

https://github.com/CatDogEngine/TestAssets/blob/main/PBR/zbrush_for_concept_-_mech_design_d.ver.zip

Sketchfab

CatDog

Without Normal Map

Blender

[T-rvw]

In source gltf file, it has 5 meshes with same materials but merged in assimp process. Maybe the root cause.
Can you give a link to skectfab model so that I can download a .fbx format file to go to use FbxProducer to test ?

[roeas]

In source gltf file, it has 5 meshes with same materials but merged in assimp process. Maybe the root cause. Can you give a link to skectfab model so that I can download a .fbx format file to go to use FbxProducer to test ?

https://sketchfab.com/3d-models/zbrush-for-concept-mech-design-dver-a421f87ebeb94b6684c28769b028dd4a