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That is not a bug with rsmb but is a result of your bridge configuration.
Your config is publishing all messages on /tst/# to the remote broker. It is also subscribed to /tst/# on the remote broker.
When you publish a message locally it is received by local subscribers and also sent over the bridge. The message is published on the remote broker and, as your bridge is subscribed to the topic, it receives a copy - hence what you perceive as a duplicate.
This is where you should make use of the local/remote prefix options to ensure you don't get this overlap of topics.