Captain's Log
The Drifter's decks are iron grating, and grating has gaps. Every time my character stepped across one, the game decided I had left the ship for a frame and let go of me. On a ship doing 28 kilometres an hour that is not a small bug. That is how you end up on the ground watching your home drive away.
The fix is a grace window. If you lose the deck for a moment and find it again quickly, the ship keeps hold of you. We ran it both ways to be sure. With grace turned off the walk failed and dropped me four times. With it on the walk passed eight for eight, and the longest gap was three frames.
Then the question was how long. I tried it and said half a second is good. That is 15 frames at the simulation's 30 a second. Short enough that walking off the edge on purpose still means walking off the edge.