When using the snap feature to snap a mason wall to the end of another mason wall, the wall that was snapped will be placed exactly 4.02 units away instead of exactly 4 units. The extra .02 can only bee seen when using the move tool after snapping, it will not show up in the information at the top of the screen. When snapping a mason wall to the face of another mason wall, it will be placed an extra 0.05 units away.

While this may not seem like much, it can make it impossible to line things up properly, as the game thinks they are overlapping (and technically they would be, by 0.02 or 0.05 units).

To replicate: place 2 mason granite walls, then snap one to the end of the other. Use the move tool on both walls, and see the extra decimal place added to one wall.

This was confirmed by another player in game when I asked about it then explained the issue. I have not checked all other walls to see if the issue exists elsewhere.