Missing tiles and buggy items in pure {7,4} Hunting Ground

[josephcsible]

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If you use Experiment with Geometry to go to the Hunting Ground in a pure {7,4} geometry, after a few seconds of walking, you'll run into missing tiles and buggy items, like this:

[jruderman]

To reproduce from the command line: ./hyper -f -geo 4x7 -gp 1 0 -W Hunt

I got a message "barrier nowall!" when this happened.