Verified in today's beta simulation [push](https://treeherder.mozilla.org/jobs?repo=try&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception&revision=1fd34c80829298f9fe46deb28287459cbfc9aec3&searchStr=Linux%2C18.04%2Cx64%2CWebRender%2Ctsan%2Copt%2CReftests%2Cwith%2Csoftware%2Cwebrender%2Cenabled%2Ctest-linux1804-64-tsan-qr%2Fopt-reftest-swr%2CR7&selectedTaskRun=IMnUj75bRLaGC-APkdUH-A.0) and the issue is indeed fixed.
Bug 1845507 Comment 2 Edit History
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Verified in today's beta simulation [push](https://treeherder.mozilla.org/jobs?repo=try&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception&revision=1fd34c80829298f9fe46deb28287459cbfc9aec3&searchStr=Linux%2C18.04%2Cx64%2CWebRender%2Cdebug%2CWeb%2Cplatform%2Ctests%2Cwith%2Csoftware%2Cwebrender%2Cenabled%2Ctest-linux1804-64-qr%2Fdebug-web-platform-tests-reftest-swr%2CWr6) and the issue is indeed fixed.