[ISSUE#5330] Fix ext plugin can't load after admin close the plugin

[moremind]

Fixes #5330 and #5332

Make sure that:

• You have read the contribution guidelines.
• You submit test cases (unit or integration tests) that back your changes.
• Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2f017d3) 61.84% compared to head (16883e4) 61.84%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5338      +/-   ##
============================================
- Coverage     61.84%   61.84%   -0.01%     
  Complexity     8689     8689              
============================================
  Files          1255     1255              
  Lines         38348    38352       +4     
  Branches       3673     3675       +2     
============================================
+ Hits          23717    23718       +1     
- Misses        12518    12520       +2     
- Partials       2113     2114       +1     

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