Intermittent failure in /css/css-text/white-space/trailing-other-space-separators-break-spaces-015.html

```
  ▶ FAIL [expected PASS] /css/css-text/white-space/trailing-other-space-separators-break-spaces-015.html
  │   → /css/css-text/white-space/trailing-other-space-separators-break-spaces-015.html 633b086c40bb5edfd5368340d4944d2581614865
  └   → /css/css-text/white-space/reference/trailing-other-space-separators-break-spaces-002-ref.html 99268a97df84a57aee9aa1d974cdbc902c3156de
```