fix: lost event during image rolling update

[free6om]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 64.94%. Comparing base (d8b3f9f) to head (716b7d2).
Report is 1 commits behind head on release-0.9.

Files with missing lines	Patch %	Lines
pkg/controller/instanceset/reconciler_update.go	16.66%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-0.9    #8424      +/-   ##
===============================================
+ Coverage        64.92%   64.94%   +0.02%     
===============================================
  Files              358      358              
  Lines            45425    45431       +6     
===============================================
+ Hits             29491    29504      +13     
- Misses           13306    13309       +3     
+ Partials          2628     2618      -10     

Flag	Coverage Δ
unittests	64.94% <16.66%> (+0.02%)	⬆️

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[free6om]

/approve