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Related to: https://stackoverflow.com/questions/68637283/how-to-customize-response-in-spring-integration-using-webflux-when-a-specific-er The function provided for the `ConsumerEndpointSpec.customizeMonoReply()` may convert incoming value to something else. With wildcards it cannot be compiled without casting. * Add `<T, V>` generic arg for the `customizeMonoReply()` to conform in and out types carrying. * Modify `WebFluxDslTests` to demonstrate the problem and confirm the fix **Cherry-pick to `5.4.x` & `5.3.x`**