Blocks phasing through each other on collision
After a discussion on this, I decided to have a look at Block phasing at high impact speeds.
To test this, I have made a new world, built an armor wall and rammed a decently sized ship into it at 100m/s. World files for before and after are attached, just enter the ship and go full force forward. You can observe the entire collision process very well using spectator cam.
The ship is now stuck inside the armor and immobile. Some parts that are definitely too large for the holes in the armor are floating around behind it.
Happy bug hunting!