Solr CDCR cannot be configured to use Aliases for replication

My company uses Solr aliases to limit the configuration changes that we need to support.
The CDCR configuration seems to accept an alias for either the source or target collections, and no errors show up in the log, but no data is replicated if the source or target is an alias and not an actual collection.

I see that aliases are not even mentioned in the CDCR documentation. It seems to me this should either work or throw an error.
It should be documented one way or another