backend/rs: server: Fix potential deadlock on object destruction

[Drakulix]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.54%. Comparing base (e777e85) to head (3375b59).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #744      +/-   ##
==========================================
- Coverage   73.49%   72.54%   -0.96%     
==========================================
  Files          46       41       -5     
  Lines        8207     6516    -1691     
==========================================
- Hits         6032     4727    -1305     
+ Misses       2175     1789     -386     

Flag	Coverage Δ
main	?
test--	?
test-client_system-	72.54% <100.00%> (?)

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