strings-test.js fails on s390x

https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/s390x/n/node-nan/20220306_113841_a17b2@/log.gz

  534 passing (12s)
  1 failing

  1) test/js/strings-test.js FromV8String should be equal:

      Error: should be equal
      + expected - actual

      -栀攀氀氀漀
      +hello

      at Test.<anonymous> (test/js/strings-test.js:36:5)
      at Object.<anonymous> (test/js/strings-test.js:14:1)

Google translate says "栀攀氀氀漀" means "gardenia" in English. I'm guessing instead the result is just garbage data. There's no indication from the test that this could resolve to anything other than "hello". The test's code is:

  /* we check Buffer.alloc rather than Buffer.from because
   * we don't want the base class Uint8Array.from */
  if (typeof(Buffer.alloc) === "function") {
    buf = Buffer.from('hello');
  } else {
    buf = new Buffer('hello');
  }
  t.equal(bindings.encodeHex(), buf.toString('hex'));
  t.equal(bindings.encodeUCS2(), 'hello');

Upstream issues https://github.com/nodejs/nan/issues/481 and https://github.com/nodejs/nan/issues/507, while fairly ancient and unlikely to relate to this particular issue, do suggest that big endian issues may not be as thoroughly tested. So perhaps this is an endian issue with this usage of the Buffer class?