Finally I found what I did wrong…
All JS scripts authenticators deployed with the JAR package are avaiable in the list of the provider field as the name specified in the META-INF/keycloak-scripts.json when adding a new execution.
I was searching the Script value in the list of the provider field.
This means that old script-based authenticator must be recreated with the Admin Console.
Also the feature.upload_scripts can be safely disabled.