I don't know what's going on there. It doesn't seem to be a missing symbol to me. There is this virtual override thunk in front of the function name which I don't understand, eg "{virtual override thunk({offset(-8)}, nsCopyMessageStreamListener::EndMessage".
I'll make a Backtrace support request.
Bug 1749276 Comment 3 Edit History
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I don't know what's going on there. It doesn't seem to be a missing symbol to me. There is this virtual override thunk in front of the function name which I don't understand, eg "{virtual override thunk({offset(-8)}, nsCopyMessageStreamListener::EndMessage". This only seems to be happening with Mac crash reports specifically.
I'll make a Backtrace support request.