Intermittent FAIL in /_webgl/conformance2/textures/misc/origin-clean-conformance-offscreencanvas.html

[CYBAI]

  ▶ ERROR /_webgl/conformance2/textures/misc/origin-clean-conformance-offscreencanvas.html
  │   → gl is null
  │ 
  │ imageLoaded@http://web-platform.test:8000/_webgl/conformance2/textures/misc/origin-clean-conformance-offscreencanvas.html:112:13
  │   ▶ FAIL [expected PASS] /_webgl/conformance2/textures/misc/origin-clean-conformance-offscreencanvas.html
  │   │   → assert_true: img was loaded expected true got false
  │   │ 
  │   │ reportTestResultsToHarness/<@http://web-platform.test:8000/_webgl/js/js-test-pre.js:123:24
  │   │ Test.prototype.step@http://web-platform.test:8000/resources/testharness.js:2595:25
  │   │ test@http://web-platform.test:8000/resources/testharness.js:628:30
  │   │ reportTestResultsToHarness@http://web-platform.test:8000/_webgl/js/js-test-pre.js:122:15
  │   │ testFailed@http://web-platform.test:8000/_webgl/js/js-test-pre.js:249:31
  │   │ assertMsg@http://web-platform.test:8000/_webgl/js/js-test-pre.js:670:19
  └   └ imageLoaded@http://web-platform.test:8000/_webgl/conformance2/textures/misc/origin-clean-conformance-offscreencanvas.html:70:12

this intermittent failure happens frequently in the past few wpt sync but it always got pass in the r+ test runs.