All nighlty scheduled pipelines from release-1.5 to release-1.6 are failing

All upgrade pipelines from release-1.5 to release-1.6 are failing during deployment of the workload cluster with the following error:

The directory passed does not contains a workload cluster kustomization.
``

https://gitlab.com/sylva-projects/sylva-core/-/wikis/Scheduled-pipelines-report#nightly---upgrade-from-release-15-to-release-16
(same issue with release1.4->release1.6)

Note that deployments of release 1.5 are working correctly : https://gitlab.com/sylva-projects/sylva-core/-/wikis/Scheduled-pipelines-report-release-1-5