Add message into errorAttributes. After changes in 158933c, "message" attribute is missing when generating response from ResponseStatusException. Found after updating spring boot to 2.3, using webflux. Steps to reproduce: 1. Create basic handlerFunction 2. flatmap entity to Mono.error(new ResponseStatusException(HttpStatus.BAD_REQUEST, "someexplanation")); 3. Send request to server. Expected: "message" attribute is "someexplanation", observed: "message" attribute is "".

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