I'm running on an older Mac Mini (purchased 2020). When the game lags a little, it sometimes loses its mind and will flicker back and forth between two different video frames. I can't reliably trigger it, but it is rare at the beginning of a game and becomes more likely as the map gets bigger. Some intermittent triggers are
- Zooming way out. There's a little lag as the display switches to a less detailed representation, and if it glitches that's when the glitch starts.
- Switching between Tiny Building Mode and Space Block Mode (whatever they're called; the spacebar does it). The glitch is more likely if the changes are rapid.
- Copying or pasting, especially big structures.
- I've noticed a couple of times when some other process on the computer wakes up briefly, and that little lag triggers the glitch.
One mode this gets into (which I wasn't able to video-capture) is that selecting some an object for placement triggers the glitch, but the game is fine while the selection is cleared. It's usual that Tiny Building Mode is more sensitive than Space Mode. So for instance I can shift-5 and place some Space Platforms and Space Roads and hit space to zoom into a platform without problems. Then maybe pressing 1 to lay some Tiny Roads glitches, and the glitch continues until I clear the selection with Escape, and I can intermittently get the glitch to come and go.