I think this is also related with Bug 1846699, Bug 1846657 and Bug 1846658 as a regression from Bug 1784880. We can follow this in this range of [backfills and retriggers](https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&resultStatus=success%2Ctestfailed%2Cbusted%2Cexception%2Crunning%2Cpending%2Crunnable&tochange=d66e162dbbb7c47fbab1e6676811c765ce276dae&fromchange=bab9bf6052724188494b5dd1b3e64acf9f0f5b12&searchStr=Linux%2C18.04%2Cx64%2CWebRender%2CShippable%2Copt%2CBrowsertime%2Cperformance%2Ctests%2Con%2CFirefox%2Ctest-linux1804-64-shippable-qr%2Fopt-browsertime-firefox-youtube-playback-h264-sfr%2Cytp-h264-sfr&selectedTaskRun=QDO9kFk-S1uffTZAaoQ5Bg.0).
Bug 1846891 Comment 2 Edit History
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I think this is also related with Bug 1846699, Bug 1846657 and Bug 1846658 as a regression from Bug 1784880. We can follow this in this [range of backfills and retriggers](https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&resultStatus=success%2Ctestfailed%2Cbusted%2Cexception%2Crunning%2Cpending%2Crunnable&tochange=d66e162dbbb7c47fbab1e6676811c765ce276dae&fromchange=bab9bf6052724188494b5dd1b3e64acf9f0f5b12&searchStr=Linux%2C18.04%2Cx64%2CWebRender%2CShippable%2Copt%2CBrowsertime%2Cperformance%2Ctests%2Con%2CFirefox%2Ctest-linux1804-64-shippable-qr%2Fopt-browsertime-firefox-youtube-playback-h264-sfr%2Cytp-h264-sfr&selectedTaskRun=QDO9kFk-S1uffTZAaoQ5Bg.0).