sync: fix the counter issue when deleting directories

[zhijian-pro]

close #5751

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.48%. Comparing base (c6b9e0d) to head (7fa8bd1).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5753       +/-   ##
===========================================
- Coverage   54.68%   21.48%   -33.21%     
===========================================
  Files         166       29      -137     
  Lines       48743    19281    -29462     
===========================================
- Hits        26657     4142    -22515     
+ Misses      19147    14642     -4505     
+ Partials     2939      497     -2442     

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