How do you delete your own code? That might be a good hint!
...but yeah, this mechanic is not well presented and I consider it a design flaw. People who playtested it struggled but said "oh im so stupid" at the end so I assumed it's good enough.
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I think it’s a brilliant plot twist: “you can do that??? of course you can do that". But the game requires you to think of it, rather than showing it to you, while in an open space — too many possibilities. A fix might be to make that room smaller in such a way that it is difficult for the player not to be in the position to do it.
Possibly relatedly, I noticed early on in a corridor that if I typed "left" while moving right, I got stuck, and my reaction at the time was "huh, kind of a bug there; they should handle it better." I learned better later, but maybe some kind of cue there might help. Yvxr vs gelvat gb qryrgr vagb rzcgl fcnpr synfurq gur rzcgl fcnpr.