Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

last region's endKey < endKey, regionEndKey: %s, endKey: %s

3. What did you see instead (Required)

last region's endKey < startKey, startKey: %s, regionStartKey: %s

4. What is your TiDB version? (Required)