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JIRA: https://jira.spring.io/browse/INT-4510 Related to https://github.com/reactor/reactor-core/issues/1290 The `Flux.publish()` and subsequent `connect()` doesn't fuse a subscriber for the hooks flow is interrupted (complete, or error, or disconnect). In this case the `FluxMessageChannel.publishers` store is not cleared from the finished publishers * Add test-case to check the `FluxMessageChannel.publishers` store after finishing the stream * Add `hide()` operator with TODO to remove when an appropriate Reactor version is ready **Cherry-pick to 5.0.x**