fix(pool): resolve a potential memory leak

[wellwelwel]

Fixes #3904.

Sorry, I'm not particularly creative for commit messages today 😅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.15%. Comparing base (0e06e02) to head (95ab17e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4111   +/-   ##
=======================================
  Coverage   90.15%   90.15%           
=======================================
  Files          86       86           
  Lines       13692    13696    +4     
  Branches     1647     1645    -2     
=======================================
+ Hits        12344    12348    +4     
  Misses       1348     1348           

Flag	Coverage Δ
compression-0	89.38% <100.00%> (+<0.01%)	⬆️
compression-1	90.13% <100.00%> (+<0.01%)	⬆️
static-parser-0	87.74% <100.00%> (+<0.01%)	⬆️
static-parser-1	88.50% <100.00%> (+<0.01%)	⬆️
tls-0	89.56% <100.00%> (+<0.01%)	⬆️
tls-1	89.93% <100.00%> (+<0.01%)	⬆️

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