On https://ews-build.webkit-uat.org/#/builders/34/builds/9190 you can check how this bot gave correct passed steps for the steps layout-tests and jhbuild (actually flatpak).
On a failure like this those steps should be returning non-zero status.
Created attachment 412022 [details]
Comment on attachment 412022 [details]
Clearing flags on attachment: 412022
Committed r268827: <https://trac.webkit.org/changeset/268827>
All reviewed patches have been landed. Closing bug.