Unexpected type mismatch error for Either and Either.Right.

VSCode Version: 1.99.3
macOS: 26.0 (25A354)
Language Support for Java(TM) by Red Hat v1.45.0
Java Version: Zulu 17.60 (but I was able to repro on multiple versions

vs code won't build the project reporting the code issue as Type mismatch for Either vs Either.Right. Either.Right is a derived class from Either.
When building with mvn compile or with other IDEs this code works just fine.

Steps to Reproduce:

1. Create a function

    public <R> Mono<Either<Throwable, ResponseEntity<List<SimpleProductTileV2>>>> noOfferProductDetails(
            BffRequestContext<R> requestContext) {
        
        // No liam return empty list of products
        return Mono.just(new Either.Right<>(new ResponseEntity<>(Collections.<SimpleProductTileV2>emptyList(), HttpStatus.OK)));
    }

2. Build
3. Get error

Type mismatch: cannot convert from Mono<Either.Right<ResponseEntity<List<SimpleProductTileV2>>>> to Mono<Either<Throwable,ResponseEntity<List<SimpleProductTileV2>>>>

mvn compile works just fine

Looks like vs code compiler incorrectly decode Either.Right or something like that.

Riprodurre il frammento Java segnalato in VS Code usando le versioni elencate di Java e Language Support for Java, quindi confrontare il risultato con mvn compile e altri IDE. L’attività è completata quando l’estensione non segnala più una mancata corrispondenza dei tipi tra Mono<Either.Right<...>> e Mono<Either<...>> per questo caso.