beta-scap-eqiad is “Waiting for next available executor on ‘deployment-deploy01” (but none of the available executors have the required “BetaClusterBastion” label), and the last build finished last Thursday. beta-mediawiki-config-update-eqiad is blocked on beta-scap-eqiad, which manifests itself as some long-delayed builds in Zuul:

On the surface, this looks very similar to T235674, though the underlying cause might be completely different for all I know.