ResponseEntity incorrectly maps values

I have two entities: Product and Variant. Each product has a set of Variant. To get a product, I have a controller endpoint:

http://localhost:8081/api/products/{id}

http://localhost:8081/api/products/{id}

http://localhost:8081/api/products/{id}

http://localhost:8081/api/products/{id}

Hence to call a product, I'll have to call this endpoint:

    @GetMapping("{productId}")
    public ResponseEntity<Object> getProduct(
        @PathVariable Long productId
    ) {
        ProductDto productDto = productService.getProduct(productId);
        return ResponseEntity.status(HttpStatus.OK).body(productDto);
    }

    @GetMapping("{productId}")
    public ResponseEntity<Object> getProduct(
        @PathVariable Long productId
    ) {
        ProductDto productDto = productService.getProduct(productId);
        return ResponseEntity.status(HttpStatus.OK).body(productDto);
    }

    @GetMapping("{productId}")
    public ResponseEntity<Object> getProduct(
        @PathVariable Long productId
    ) {
        ProductDto productDto = productService.getProduct(productId);
        return ResponseEntity.status(HttpStatus.OK).body(productDto);
    }

    @GetMapping("{productId}")
    public ResponseEntity<Object> getProduct(
        @PathVariable Long productId
    ) {
        ProductDto productDto = productService.getProduct(productId);
        return ResponseEntity.status(HttpStatus.OK).body(productDto);
    }

Well, I have tried debugging the problem and even explicitly serializing the objects before I pass it to the ResponseEntity's body, none works. Images attached described my attempt on verifying whether the object passed to the

.body

.body

.body

.body was changed:

Left picture: I explicitly serialize it and debugging the output to the console. You can see that the serialization process works correctly.

Right picture: I only printed the first and last variant id of the product's variants. It resulted in the correct return of variant ids.

ResponseEntity incorrectly maps values

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