Same problem seems to appear in n=6, 14, 18, 22, 26, etc. (is there no test for n=10?)
Its quite easy to adapt the solution so it still works, but might be better to fix it if possible.

Test for n = 4 is no more.

There is a bug in java production test.

For n = 4 and greater even numbers properly result is:
[1, 1, 1, 1]
[0, 0, 0, 1]
[1, 0, 0, 1]
[1, 1, 1, 1]

your test result:
[1, 1, 1, 1]
[0, 0, 0, 1]
[1, .1., 0, 1]
[1, 1, 1, 1]

You are adding a one '1' too much, and it is necessary to remove last 1 from snake.