fix: allow reuse for sphere reg derivatives

[mgxd]

Fixes #575

We are due for a new release, as a lot of fixes in master should be propagated to end user tools.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.03%. Comparing base (3c76b5b) to head (fa87ea7).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #576      +/-   ##
==========================================
+ Coverage   89.00%   89.03%   +0.03%     
==========================================
  Files          23       23              
  Lines        2065     2071       +6     
  Branches      273      277       +4     
==========================================
+ Hits         1838     1844       +6     
  Misses        155      155              
  Partials       72       72              

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