Edges of models wrongly take texture from neighbouring tiles on texture sheet

I am trying to use a big sheet for all the textures in game. When making a first ground block (making model and UV map in blender) I noticed that edges of each cube is "highlighted" by texture from neighbouring tiles from sheet. Texture sheet has exact size of 512x512 in both file and unity, filter is point-type, format - truecolor. UV map in blender done by typing in the pixel position, full integers. How to make these edges not to appear? (red texture borders for better visibility)