Composer Stager was broken by Symfony Process 7.1.1, due to a regression in Symfony. That's not fixed yet, so Composer Stager has tagged a new 2.0.0-rc4 release that works around it. We need to update to that.
Issue fork automatic_updates-3453030
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Start within a Git clone of the project using the version control instructions.
Or, if you do not have SSH keys set up on git.drupalcode.org:
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Comment #3
phenaproximaComment #5
phenaproximaThis is breaking us, and Project Browser, so I think I need to go ahead with this.