I have a "quicktest" job set to: "Promote immediately once the build is complete" and nothing else.
This should happen automatically when the tests complete and they all pass, ie when "stable".
This works; the promotion is named "Bedrock-DEV-GF-EL-quicktest promoted"

The "quicktest" job triggers (via parameterized trigger plugin) a downstream job "zipfile" which packages the project for release to QA, if "quicktest" is stable.
The zipfile job is set promote:
"Promote immediately once the build is complete" &&
"When the following upstream promotions are promoted" promotion names: "Bedrock-DEV-GF-EL-quicktest promoted"

I'd expect this zipfile job to get promoted, but it doesn't happen; The Promotion status screen says:
Bedrock-DEV-GF-EL-zipfile promoted
This promotion has not happened.
Met Qualification
Automatically promoted immediately after the build
Unmet Qualification
Upstream promotions
Bedrock-DEV-GF-EL-quicktest promoted