`./mach --log-mach-level=debug [...]` should could provide more insight. An attempt to hack that in is at https://treeherder.mozilla.org/jobs?repo=try&revision=566ceb799ca5ca6db9f117e5c70cf482b7803e6a.
Bug 1834319 Comment 8 Edit History
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`./mach --log-mach-level=debug [...]` could provide more insight. An attempt to hack that in is at https://treeherder.mozilla.org/jobs?repo=try&revision=566ceb799ca5ca6db9f117e5c70cf482b7803e6a.