please help me! I encountered difficulties using the "AdminClient. list_offsets" method

Description
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Hello！

I encountered difficulties using the "AdminClient. list_offsets" method, I want to obtain the timestamp corresponding to the offset,
However, the timestamp obtained using the "result. timestamp" method is a negative timestamp(console: Timestamp: -1251536750), The timestamp of this message should be "1703850479000"

The code is as follows:

`topic_partition_offsets = dict()`
`topic_partition = TopicPartition(topic, partition)`
`topic_partition_offsets[topic_partition] = OffsetSpec.for_timestamp(1703847600000)`
`future_map = AdminClient({xxx}).list_offsets(topic_partition_offsets, request_timeout=15)`
`for tp, future in future_map.items():`
` result = future.result()`
` print(result.timestamp)`

How to reproduce
================

Checklist
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Please provide the following information:
- [x] confluent-kafka-python and librdkafka version: `2.3.0`
- [x] Apache Kafka broker version: `2.8`
- [x] Client configuration: `{'bootstrap.servers': xxx, 'security.protocol': 'SASL_PLAINTEXT', 'sasl.mechanism': 'SCRAM-SHA-256', 'sasl.username': xxx, 'sasl.password': xxx}`
- [x] Operating system: `Windows 11`
- [x] Provide client logs (with `'debug': '..'` as necessary)
- [ ] Provide broker log excerpts
- [x] Critical issue