We had a chance to investigate this bug yesterday to mixed results - the actual ownership issue is coming from further up the chain and the tooling on the current hardware does not provide for us an easy fix. When we change the hardware and tooling on which we generate the signed .pkgs, we will be able to fix this. For now, moving to releng.
Bug 1812480 Comment 5 Edit History
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We had a chance to investigate this bug yesterday to mixed results - the actual ownership issue is coming from further up the chain and the tooling on the current hardware does not provide for us an easy fix. Current hardware in our release pipeline which executes packaging code involves older mac minis with tooling outdated to the necessary commands to create copies of the archive with the correct ownership, or to change the ownership altogether. When we change the hardware and tooling on which we generate the signed .pkgs (part of a larger project), we will be able to fix this. For now, moving to releng.