fix: use existing storage version on overwrite, if none specified

[westonpace]

This was supposed to be the logic but was not tested and was not being used correctly.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.84%. Comparing base (ea78168) to head (213e9bc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2924      +/-   ##
==========================================
+ Coverage   77.83%   77.84%   +0.01%     
==========================================
  Files         231      231              
  Lines       70199    70259      +60     
  Branches    70199    70259      +60     
==========================================
+ Hits        54636    54690      +54     
- Misses      12691    12693       +2     
- Partials     2872     2876       +4     

Flag	Coverage Δ
unittests	77.84% <100.00%> (+0.01%)	⬆️

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