Tile Sprites render incorrectly when pixels per unit is low and margins are small

[yaustar]

Project: https://playcanvas.com/project/919232/overview/tiled-sprite-project

When the pixles per unit is 1 and the margins are close or the same as the boundary of the sprite, the mesh is larger than the sprite bounds

eg

Renders like this:

Whereas a sprite with the boundaries

Renders correctly