It happened with shader MTE/Standard/4 Textures/Bumped.
A workaround supposed by user TA-AQ (q35xxx66):
This can be fixed by using UnpackNormalWithScale instead of UnpackNormal in the shader:

This approach is the same as the one used in Unity's terrain shader TerrainSplatmapCommon.cginc in a recent version of Unity.

This is to be verified.
It happened with shader MTE/Standard/4 Textures/Bumped.
A workaround supposed by user TA-AQ (q35xxx66):

This can be fixed by using
UnpackNormalWithScaleinstead ofUnpackNormalin the shader:This approach is the same as the one used in Unity's terrain shader

TerrainSplatmapCommon.cgincin a recent version of Unity.This is to be verified.