Fix custom quantity reductions

[svchb]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 88.09524% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.90%. Comparing base (7e43937) to head (b34d761).

Files with missing lines	Patch %	Lines
test/general/custom_quantities.jl	83.33%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1184      +/-   ##
==========================================
- Coverage   89.92%   89.90%   -0.02%     
==========================================
  Files         132      132              
  Lines       10434    10464      +30     
==========================================
+ Hits         9383     9408      +25     
- Misses       1051     1056       +5     

Flag	Coverage Δ
total	89.90% <88.09%> (-0.02%)	⬇️
unit	70.62% <88.09%> (+0.10%)	⬆️

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