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@RestController
public class SampleController {

    @RequestMapping(path = "")
    public String demo(){
        return "test";
    }
}

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See spring-projects/spring-boot#33499 for initial report. It looks like the enhancement in #29625 was incomplete.

The goal was to make the following work for both http://localhost:8080 and http://localhost:8080/:

@RestController
public class HomeController {

    @GetMapping
    public String home() {
        return "Hello, World!";
    }

}
But this use case doesn't work still, as the fix was focusing on the combining of @RequestMapping annotations. In the code snippet above, org.springframework.web.servlet.mvc.condition.PathPatternsRequestCondition#combine is never called as org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping#getMappingForMethod will only call it if the RequestMappingInfo is available on the type. Here, it's null so the combination never happens.

#29625 did change the following, when the controller type itself is annotated with @RequestMapping.

@RestController
@RequestMapping
public class HomeController {

    @GetMapping
    public String home() {
        return "Hello, World!";
    }

}