I'd been playing in the tutorial scene for about 15 minutes when something odd started happening... The terrain seemed to smear in a certain area of the map, which introduced graphical fugliness and stretched a part of my base upwards (See in the attached zip "TestDump000.png").

A while later, it happened in another spot (TestDump001.png). And then it happened again (TestDump002.png)...

So, uhm... That's weird. And needs to be fixed. Good luck with that.

This is a fairly old bug. It tends to occur at the top of the map, and has happened since at least B19. Possibly B18.

wow too much debris lol.
pretty wierd... :/ idk what else i can say lol.

Normaly happends when something hit the debris on the top or the camera move too fast (at least for me).
Only way to prevent it is using high scenes... sorry

This bug often results in your actor being pushed out of the screen when the debris builds up to this stage, it's not fun, and it's usually fatal.

It's a very old bug, my advice: play shorter games.