Intermittent FAIL /css/CSS2/text/white-space-pre-002.xht

[ferjm]

{"status": "FAIL", "group": "default", "message": "/css/CSS2/text/white-space-pre-002.xht d51585be25f0e8564e8131b4656b6ea9e896e27f\n/css/CSS2/text/white-space-pre-002-ref.xht 2d16c75b04e5cab422aeacdc467313021882a594\nTesting d51585be25f0e8564e8131b4656b6ea9e896e27f == 2d16c75b04e5cab422aeacdc467313021882a594", "stack": null, "subtest": null, "test": "/css/CSS2/text/white-space-pre-002.xht", "line": 18418, "action": "test_result", "expected": "PASS"}