BUG: Tileset edge - flickering black lines on camera move

Hi,
I followed this tutorial to manage gigantic tilemap…

It works but on edges of each tile chunk there is a flickering on camera move…
ISSUE VIDEO: https://www.youtube.com/watch?v=cdudHWcA3Zc&feature=youtu.be

Tilemap is OK, nothing wrong here… this is just happening on edges of each tilemap scene
Can someone help how to prevent this?

It’s happening mostly on mobiles and tablets

Thanks for any help