Block bourders appearing when having the same colour
For example, the large grid block has these metal bars on its corners and edges, which appear when the block isn't connected to another one, has an open edge or meets another block with a different colour.
For me these bars sometimes appear even with the same colour.
I was building my base in the standard grey when sometimes, but quite often, these edges appear.
Then I have to press shift+p on an older block with the same colour and repaint the block that I have build to fix that, but this is really annoying.