Presence of Single Consumer is forcing other producers exposed under output-bindings property to be treated as BindableFunctionProxyFactory bean with "functionExist" parameter set to TRUE, even when Streambridge is used instead of Supplier

[Saumrit]

In one of the microservice , i am having one Producer, for which StreamBridge is used instead of Supplier and a consumer which is backed up by Consumer Functional interface. Because of the presence of only one consumer , i see the producer which is exposed under spring.cloud.stream.output-bindings application property , is registered as BindableFunctionProxyFactory bean with "functionExist" parameter set to TRUE . [While debugging i see normalizeFunctionDefinition() from org.springframework.cloud.function.context.catalog.SimpleFunctionRegistry is doing this explicitely when only one consumer is pressent]

• I was expecting this to be false since there is no Supplier backing it up for my producer. Now i am confused if its a BUG or any purpose is there behind it .
• What to do so that "functionExist" will set to FALSE for the producer in my case since i have only one consumer backed UP by Consumer interface and exposed under spring.cloud.function.definition property.
• Please let me know if in this scenario i should avoid output-bindings property.
• And what is the real use of output-bindings apart from pre-creating the bindings ? Is it mandatory to use when i go with Streambridge?