Bug Tiles have little gaps only through camera

Hi,
I'm setting up a project and I have a problem with the tilemap :

There's tiny gaps that appears depending on the camera's position and aspect ratio.
Pixel Perfect Camera component is present on the camera, Asset PPU set to the same as the sprite. Sprite filter mode set to Point and no compression.

Run in Editor Mode clearly show there's something off but I can't find what.
It doesn't occur with every tiles, the dark ones doesn't behave like this.

Can you help me?

Thank you !

 

Your Game tab is set to Scale 1.1x, does it look right when you drag the slider all the way left to 1.0x?

 

Yes the scale doesn't change anything.
It looks like some tiles are getting moved down by 1 pixel for some reason

 

Did you used a sprite atlas with at least padding of 2 pixels for all sprites/tiles shown?

 

Isn't sprite atlas used mostly to reduce draw calls?
Forgot to tell but I use a spritesheet so it's in Multiple mode :

Creating a sprite atlas didn't changed anything, until I pressed play and Unity decided to do it's magic. It's weird that in all tutorial for pixel perfect game nobody was talking about sprite atlas (too obvious to tell?).
Thank you!

 

It's not that the sprite atlas by itself helps directly -> it's the option to add additional colored padding during creation of sprite atlas. There are other ways to add padding and achieve the same result without Sprite Atlas, but the sprite atlas is quick and easy way to do it without requiring to make major changes to your workflow.

You might want to look at this response giving more examples https://forum.unity.com/threads/why...at-certain-screen-sizes.1402474/#post-8822728