LEAK: ByteBuf.release() was not called before it's garbage-collected. about reactor-netty HOT 4 CLOSED

public Optional<Path> downloadAndUnZip(String url) throws MyClientException, MyFileException {
        String baseUrl =url;
        if (baseUrl == null) {
            throw new MyClientException("Invalid URL");
        }
        String uri = url.substring(url.indexOf(baseUrl) + baseUrl.length());
        log.info("Download uri: {}", uri);
        Mono<DataBuffer> dataBufferFlux = fetchDownloadAndUnZip(uri);
-->  dataBufferFlux.block();
        String exportZipName = uri.substring(uri.lastIndexOf("/"));
        return fileService.writeZipFile(dataBufferFlux, exportZipName);
    }