In 4.25.1 it looks much worse than ever before, even without any normal map there are extremely visible seams (this time even on the diffuse texture material, which are visible in Lit Mode, but not in Unlit Mode, so it is no problem with the uv layout, but with the skincache), with “support compute skincache” checked.
Support compute skincache is important for using Dual Quaternion Skinning Mode, because without it there are ugly shadows at spots like armpits, where JCMs/Morph Targets are being used (for bulge reduction), esp. with poses like arms up etc. Most people won’t even notice this as they only use some standing/idle or walk anims, but my project heavily depends on regularly using animations like gym exercises, fighting, dancing, stretching, where this glitch is very visible and thus annoying etc.
Even in 4.24 the workout from above didn’t really help and I was never able to use any normal map+support compute skincache without visible seams. Is there really no workaround?