msgunsubscribe does not unsubscribe topics in EAServer

[CR #441614] EAServer only – the msgconsume(subscription_name) function does not work if you use msgunsubscribe on a durable subscription for a topic using:

select msgunsubscribe('subscription_1' WITH REMOVE)

Workaround: Instead of using the msgunsubscribe command, use a different subscription name to subscribe to the same topic with different clients.