https://wpt.live/webrtc/RTCRtpTransceiver.https.html crashes both on Catalina on Azure Pipelines and on Big Sur locally in STP116. This appears to be a regression from STP115.
Thanks for the report, seems like a null pointer crash in the checkStopAfterCreateOfferWithReusedMsection subtest. This might be fall outs of the new implementation of transceiver.stop and we might want to switch to the new standard compliant version.
Created attachment 414824 [details] Patch
<rdar://problem/71747895>
Created attachment 415115 [details] Patch
Committed r270304: <https://trac.webkit.org/changeset/270304> All reviewed patches have been landed. Closing bug and clearing flags on attachment 415115 [details].