Intermittent failure in /html/semantics/scripting-1/the-script-element/script-not-executed-after-shutdown.html

[jdm]

  ▶ Unexpected subtest result in /html/semantics/scripting-1/the-script-element/script-not-executed-after-shutdown.html:
  │ FAIL [expected PASS] Script is not executed after script thread is shutdown
  │   → assert_unreached: script executed in removed iframe Reached unreachable code
  │ 
  └ @http://web-platform.test:8000/html/semantics/scripting-1/the-script-element/script-not-executed-after-shutdown.js?pipe=trickle(d3):1:1