Alpha of inner borders of sprites

[Tr0sT]

My prefab consists of 3 sprites with the same sizes. Each sprite has different Z-coord, and the same X and Y coords. The problem is that there are transparent borders between sprites in the game and editor regardless of chosen padding and trimming.
Sprites:
1. 2.  3.

My result:

I have already tried each padding type and "1:1" button. Premultiplied alpha is on.
What sprite collection's settings should I use or how to change sprites?

[unikronsoftware]

This looks like for me - I can't think of what setting would cause that issue youre seeing. If you post a repro I'll be happy to take a look...