syncer: make log clearer when load region

[lhy1024]

What problem does this PR solve?

Issue Number: Close #8717

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nolouch, okJiang

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-16 03:57:18.589925148 +0000 UTC m=+416235.738834973: ☑️ agreed by nolouch.
• 2024-10-16 06:27:33.931727163 +0000 UTC m=+425251.080636995: ☑️ agreed by okJiang.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.70%. Comparing base (48e72f1) to head (6ec0362).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8718      +/-   ##
==========================================
- Coverage   71.70%   71.70%   -0.01%     
==========================================
  Files         517      517              
  Lines       67450    67457       +7     
==========================================
+ Hits        48364    48368       +4     
  Misses      15521    15521              
- Partials     3565     3568       +3     

Flag	Coverage Δ
unittests	71.70% <100.00%> (-0.01%)	⬇️

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