Prefix scan didn't work well when enabling the cluster mode

### Search before asking

- [X] I had searched in the [issues](https://github.com/apache/kvrocks/issues) and found no similar issues.

### Version

centos 7.9

Kvrocks was running with two cluster nodes and slot distributions are 0-8191 and 8192-16383
(kvrocks 2.6.0 内含两个节点的集群，slot分别为0-8191、8192-16383)

### Minimal reproduce step


### What did you expect to see?

return keys should start with f character.

返回以f开头的key

### What did you see instead?

-

### Anything Else?
1.触发场景可能与大量的key被删除有关，因为当时的场景就是删除大量的key
2.依稀记得当时执行scan的时候，在程序里面超时了；然后我手动在redis-cli里面执行，响应速度也很慢

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

The payload names no source file or test. Reproduce the scan in a two-node cluster with slots 0-8191 and 8192-16383, including the large-deletion condition, and compare prefix results and latency; done when SCAN reliably returns the expected f-prefixed keys.

Written by the indexing model from the issue text.