public class ConvertingEngineBuilder<R> implements Builder<R> {

@SuppressWarnings("unchecked")
@Override
public DebeziumEngine<R> build() {
.
.
.
keyConverter = createConverter(formatKey, true);
valueConverter = createConverter(formatValue, false);


toFormat = (record) -> {
    final byte[] key = keyConverter.fromConnectData(TOPIC_NAME, record.keySchema(), record.key());

final byte[] value = valueConverter.fromConnectData(TOPIC_NAME, record.valueSchema(), record.value());
// Here the 'value' and record.value() has accents

    return isFormat(formatKey, Json.class) && isFormat(formatValue, Json.class)
            || isFormat(formatValue, CloudEvents.class)
// Here, with "new String(value)" you are loosing accents
// You can check the bytes between "byte[] value" & "new String(value) bytes"
// You can replace by "new String(value, StandardCharsets.UTF_8)" to fix it
                    ? (R) new EmbeddedEngineChangeEvent<String, String>(
                            key != null ? new String(key) : null,
                            value != null ? new String(value) : null,
                            record)
                    : (R) new EmbeddedEngineChangeEvent<byte[], byte[]>(
                            key,
                            value,
                            record);
};