This was reported by kivi on the V track.
The last canonical test case has expected output with 8 chunks
"imtgdvs fearwer mayoogo anouuio ntnnlvt wttddes aohghn sseoau "
but the description incorrectly says 7 chunks.
"description": "54 character plaintext results in 7 chunks, the last two with trailing spaces",
We should replace the last test case so the description is corrected.