*: fix a bug for default_authentication_plugin

[CbcWestwolf]

What problem does this PR solve?

Issue Number: ref ##54138

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

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[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 3 lines in your changes missing coverage. Please review.

Project coverage is 73.5105%. Comparing base (aeed37b) to head (51a9f73).
Report is 17 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57391        +/-   ##
================================================
+ Coverage   72.8693%   73.5105%   +0.6411%     
================================================
  Files          1672       1672                
  Lines        461965     462324       +359     
================================================
+ Hits         336631     339857      +3226     
+ Misses       104569     101774      -2795     
+ Partials      20765      20693        -72     

Flag	Coverage Δ
integration	43.5517% <70.0000%> (?)
unit	72.3068% <83.3333%> (+0.0579%)	⬆️

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Components	Coverage Δ
dumpling	52.7673% <ø> (ø)
parser	∅ <ø> (∅)
br	45.1287% <ø> (ø)

[ti-chi-bot]

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Tests

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