cosign sign record-creation-timestamp=true not taken into account for new bundle format

[baal-lgln]

Description

Since v3 the record-creation-timestamp=true parameter for the cosign sign command is no longer taken into account in our IBM Container registry for the new bundle format and no date is added to the OCI manifest in our registry.

The problem is that we have rules inside this registry to delete "old" manifests and manifests without dates are recognized as old manifests.
The same problem is described in detail here:

• OCI manifest created timestamp wrong with v2.2.0 #3298
• Add support for recording creation timestamp for cosign attest #3797

These screenshots show how the old format is correctly shown with da date (created with the workaround --new-bundle-format=false --use-signing-config=false) and the new bundle format is without a date:

Is there any way to add a date without using the workaround --new-bundle-format=false --use-signing-config=false?

Version
cosign v3.0.2