Deprecated artefacts will continue to be supported as long as the version in which they were deprecated remains in-support. Customer-raised defects will continue to be addressed in the deprecated artefacts during this period. All future enhancement requests will be directed toward the replacement functionality.
Deprecation of an artefact is an indication of the intent to remove it in a future version. However, a deprecated artefact will remain in- support as long as the version it was deprecated in remains in-support. After that, it is subject to removal without further notice. Extended support for specific artefacts will be considered as long as the request is made in good time (no less than 6 months in advance of the relevant version falling out of general support).
You are advised to address any dependencies from Custom code on deprecated Cúram artefacts at the earliest opportunity. The replacement functionality offers better support and better upgrades in future. When deprecated artefacts are removed in a future release, it can cause compilation failures and this can seriously hamper effective planning of upgrade tasks.