🧩 Problem Summary (in English):
Issue:
I’m experiencing unexpected white/gray seams or "halo" edges between image parts in my Spine character after importing into Unity (URP project).
These seams are especially visible around semi-transparent areas like lips or overlapping parts.

However, this issue does not exist in my previous Unity project using exactly the same exported Spine assets (.skel / .atlas / .png). So I’m confident the export settings and the assets themselves are correct.

✅ What I have already checked and confirmed:
✅ Using URP project

✅ Using latest spine-unity 4.2 from official GitHub UPM URL

✅ Installed both:

"com.esotericsoftware.spine.spine-csharp"

"com.esotericsoftware.spine.spine-unity"

"com.esotericsoftware.spine.urp-shaders"

✅ Shader in use is Spine/URP/Skeleton PMA Multiply

✅ Color space set to Gamma

✅ Straight Alpha Texture is set to false

✅ Texture import settings match previous working project:

sRGB: ✅ On

Alpha is Transparency: ❌ Off

Texture Type: Default

✅ Unity version is the same as previous project

✅ No warnings or material setup issues visible in SkeletonData component

✅ Other assets in the project display normally; issue only appears on Spine character

❌ What I tried (but didn't fix it):
❌ Re-exporting Spine JSON with "Premultiplied Alpha" unchecked

❌ Switching Shader to Skeleton PMA Additive, Straight, Screen, etc.

❌ Switching Color Space between Linear and Gamma

❌ Manually toggling “Straight Alpha Texture” flag in material

❌ Replacing .skel, .atlas, .png with known-good copies

❌ Following tutorials and fixes from YouTube (especially about shader or material mismatch) — didn’t help

❌ Completely deleting and re-installing spine-unity via GitHub UPM

💡 Hypothesis:
Since the exact same asset works correctly in the previous project, I suspect the cause lies in:

Either a subtle difference in URP shader setup or post-processing,

Or a Unity texture import pipeline difference triggered by the current project setup,

Or perhaps an invisible project setting difference I overlooked.

🙏 What I Need Help With:
Is there any known reason why PMA textures would show edge artifacts in URP despite correct setup?

Are there extra shader settings / customizations I may need to carry over from previous project?

Can you confirm if URP + PMA Multiply Shader still needs manual tweaks in certain Unity versions?

Let me know if you’d like me to attach comparison screenshots or Unity package files — I can provide both the working project and broken one.

Thank you so much in advance 🙏