br txn for backup and recovery Error，startKey > endKey
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Description
## Bug Report
## 1. Minimal reproduce step (Required)
I only used TikV, not Tidb; There was a problem when using br txn for backup and recovery, and the storage location is bucket of cephrgw .The version of tikv is v6.5.3
Here are my steps：
1 First created two tikv clusters
2 Juicefs uses one of the tikv clusters as a metadata engine and creates 400000 empty files,
3 Successfully backed up using the br tool，
4 Error reported when using the br tool to restore data to a new cluster
Error: startKey > endKey, startKey: 6a66733031fd4174ff3804000000000049ff0000000000000000f7, endkey: 0000000000000000f7: [BR:Restore:ErrRestoreInvalidRange]invalid restore range
5 View the logs of the br tool
### 2. What did you expect to see? (Required)
Successfully restored data to the new tikv cluster using the br tool。
### 3. What did you see instead (Required)
Error: startKey > endKey, startKey: 6a66733031fd4174ff3804000000000049ff0000000000000000f7, endkey: 0000000000000000f7: [BR:Restore:ErrRestoreInvalidRange]invalid restore range
### 4. What is your TiDB version? (Required)
I only used TikV, not Tidb; The version of tikv is v6.5.3
The above is the entire usage process. Please give me some ideas or other help，Thank you so much.
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